Much research and study of the baby head issues relies on past accounts and catalogues which record and describe the issues of that time. The available literature can be divided broadly into two groups, those published in the Spanish language and those in the English language.
The Postage Stamp Catalogue 53rd edition, 1892-1893, Scott Stamp and Coin Company Ltd, New York.
The Standard Postage Stamp Catalogue 55th edition, 1895, Scott Stamp and Coin Company Ltd, New York.
The Standard Postage Stamp Catalogue 58th edition, 1898, Scott Stamp and Coin Company Ltd, New York.
Scott Stamp and Coin Co’s Standard Catalogue of Postal Cards and Letter Cards, 1898, Scott Stamp and Coin Company Ltd, New York.
Scott’s Standard Postage Stamp Catalogue 59th edition, 1900, Scott Stamp and Coin Company Ltd (1899), New York.
Scott’s Standard Postage Stamp Catalogue 62nd edition, 1903, Scott Stamp and Coin Company Ltd (1902), New York.
Scott’s Standard Postage Stamp Catalogue 63rd edition, 1904, Scott Stamp and Coin Company Ltd (1903), New York.
Scott’s Standard Postage Stamp Catalogue 64th edition, 1905, Scott Stamp and Coin Company Ltd (1904), New York.
Scott’s Standard Postage Stamp Catalogue 65th edition, 1906, Scott Stamp and Coin Company Ltd (1905), New York.
Scott’s Standard Postage Stamp Catalogue 66th edition, 1907, Scott Stamp and Coin Company Ltd (1906), New York.
Scott’s Standard Postage Stamp Catalogue 67th edition, 1908, Scott Stamp and Coin Company Ltd (1907), New York.
Scott’s Standard Postage Stamp Catalogue 68th edition, 1909, Scott Stamp and Coin Company Ltd (1908), New York.
Scott’s Standard Postage Stamp Catalogue 69th edition, 1910, Scott Stamp and Coin Company Ltd (1909), New York.
Scott’s Standard Postage Stamp Catalogue 70th edition, 1911, Scott Stamp and Coin Company Ltd (1910), New York.
Scott’s Standard Postage Stamp Catalogue 71st edition, 1912, Scott Stamp and Coin Company Ltd (1912), New York.
Scott’s Standard Postage Stamp Catalogue 72nd edition, 1914, Scott Stamp and Coin Company Ltd (1913), New York.
Scott’s Standard Postage Stamp Catalogue 73rd edition, 1915, Scott Stamp and Coin Company Ltd (1914), New York.
Scott’s Standard Postage Stamp Catalogue 74th edition, 1916, Scott Stamp and Coin Company Ltd (1915), New York.
Scott’s Standard Postage Stamp Catalogue 75th edition, 1917, Scott Stamp and Coin Company Ltd (1916), New York.
Scott’s Standard Postage Stamp Catalogue 76th edition, 1919, Scott Stamp and Coin Company Ltd (1918), New York.
Scott’s Standard Postage Stamp Catalogue 77th edition, 1920, Scott Stamp and Coin Company Ltd (1920), New York.
Scott’s Standard Postage Stamp Catalogue 78th edition, 1922, Scott Stamp and Coin Company Ltd (1921), New York.
Scott’s Standard Postage Stamp Catalogue 79th edition, 1923, Scott Stamp and Coin Company Ltd (1922), New York.
Scott’s Standard Postage Stamp Catalogue 80th edition, 1924, Scott Stamp and Coin Company Ltd (1923), New York.
Scott’s Standard Postage Stamp Catalogue 81st edition, 1925, Scott Stamp and Coin Company Ltd, New York.
Scott’s Standard Postage Stamp Catalogue 82nd edition, 1926, Scott Stamp and Coin Company Ltd, New York.
Scott’s Standard Postage Stamp Catalogue 96th edition, 1940, Scott Publications Inc (1939), New York.
Scott’s Standard Postage Stamp Catalogue 116th edition, 1960, Scott Publications Inc (1959), New York.
Scott 1980 Standard Postage Stamp Catalogue 136th edition (in 4 volumes), Scott Publishing Company (1979), Sidney OH.
Scott 1990 Standard Postage Stamp Catalogue 146th edition (in 4 volumes), Scott Publishing Company (1989), Sidney OH.
Scott 2000 Standard Postage Stamp Catalogue 156th edition (in 6 volumes), Scott Publishing Company (1999), Sidney OH.
Scott 2010 Standard Postage Stamp Catalogue 166th edition (in 6 volumes), Scott Publishing Company (2009), Sidney OH.
Scott 2015 Standard Postage Stamp Catalogue 171st edition (in 6 volumes), Scott Publishing Company (2014), Sidney OH.
Scott 2020 Standard Postage Stamp Catalogue 176th edition (in 6 volumes), Scott Publishing Company (2019), Sidney OH.
Edifil, 1964. ‘Catalogo Edifil de los Sellos de España y Colonias’ 1st
edition, Madrid
Catalogo Unificado y Especializado de España y Dependencias Postales 1966, Edifil S.A., Madrid.
Catalogo Edifil Unificado Espana y Dependencias Postales 1982, Edifil S.A., Madrid.
Catalogo Edifil Unificado Especializado Sellos De Espana, Tomo IV Dependencias Postales 2002, Edifil S.A., Madrid.
Catalogo Edifil Unificado Espana y Dependencias Postales 2012, Edifil S.A., Madrid.
Stanley Gibbons Priced Catalogue of Stamps of Foreign Countries, Part II Foregin Countries 17th edition 1905 Stanley Gibbons Ltd, London.
Stanley Gibbons Priced Catalogue of Stamps of Foreign Countries, Part II Foregin Countries 17th edition 1911 Stanley Gibbons Incorporated, New York, USA.
Stanley Gibbons Priced Catalogue of Stamps of Foreign Countries, Part II Foregin Countries 25th edition 1915 Stanley Gibbons Ltd, London.
Stanley Gibbons Priced Catalogue of Stamps of Foreign Countries, Part II Foregin Countries 34th edition 1930 Stanley Gibbons Ltd, London.
Stanley Gibbons Priced Catalogue of Stamps of Foreign Countries, Part II Foregin Countries, Europe and Colonies 50th edition 1955 Stanley Gibbons Ltd, London.
Stanley Gibbons Overseas 4 Stamp Catalogue, P-Z, 1st edition 1975 Stanley Gibbons Ltd, London.
Stanley Gibbons Stamp Catalogue, Part 9 Portugal & Spain 1st edition 1980, Stanley Gibbons Publications Ltd, London.
Stanley Gibbons Stamp Catalogue, Part 9 Portugal & Spain 2nd edition 1984, Stanley Gibbons Ltd, London.
Stanley Gibbons Stamp Catalogue, Part 21 South East Asia 4th edition 2004, Stanley Gibbons Ltd, Ringwood Hants.
Stanley Gibbons Stamp Catalogue, Part 21 South East Asia 5th edition 2012, Stanley Gibbons Ltd, Ringwood Hants.
Anon. 1902. ‘Catálogo de Sellos
de España y Colonias’, 1st edition publ. Guipuzcoa.
Anon. 1914. ‘Catálogo de Sellos
de España y Colonias’, 5th edition publ. Guipuzcoa.
Casa Filatelica Hevia, 1975. 'Catalogo Hevia de sellos de Espana ex colonias espanolas y provincias africanas 1974-1975', 28th edition publ. Madrid.
Ceballos G, 1902. ‘Catálogo Regulador Ilustrado de Compra y Venta de los
Sellos de Correos, Telégrafos y Fiscales de España y Colonias’, 1st
edition, publ. Madrid.
Ceballos G, 1903. ‘Catálogo Regulador Ilustrado de Compra y Venta de los
Sellos de Correos, Telégrafos y Fiscales de España y Colonias’, 2nd
edition, publ. Madrid.
Cotter B & Quinto F, 1897. ‘Catalogo Descriptivo de Sellos de Correos Telegrafos y Tarjetas Postales de las Islas Filipinas’, publ. Manila.
Galvez M, 1896. ‘Catalogo Descriptivo del los Sellos de Correos de Espana y sus Colonias’ 5th edition, (successor to Lopez) publ. Madrid.
Galvez M, 1898. ’Catalogo Galvez, Sellos de Correos y Telegrafos, Primera Edicion’, (1st edition of Universal Catalogue), publ. Madrid.
Galvez M, 1910. ‘Catalogo Descriptivo del los Sellos de Correos de Espana y sus Colonias’ 7th edition, publ. Madrid.
Galvez M, 1932. ’1933 Catalogo Normal de los Sellos de Correos y Telegrafos de Espana Colonias y Ex Colonias’, publ. Madrid.
Galvez M, 1942. ‘1943-1944 Catalogo Especial de los Sellos de Correos y Telegrafos de Espana Colonias y Ex Colonias’, publ. Madrid.
Graus Fontova F, 1983. ‘Manual de Consulta de Falsos de Espana’. Series IX, Barcelona, Spain.
Harris L, 1898. ‘Catálogo General de los Sellos de Espana y sus Colonias usados en Correos y Telégrafos des de 1850 a 1898’, publ. L Harris and Company, Madrid.
Herráiz J A, 2016. ‘Manual de las Tarifas Postales de España y sus posesiones de Ultramar. Tomo II (1850-1900)’. (pp 501, 502).
Hevia, 1973. ‘Catalogo Hevia de España 1973-74 ex colonias españolas y provincias africanas’ 27th edition, publ. Madrid
Hevia, 1974. ‘Catalogo Hevia de España 1974-75 ex colonias españolas y provincias africanas’ 28th edition, publ. Madrid
Laguna F, 1900. ‘Catálogo General de los Sellos de España y sus Colonias
usados en Correos y Telégrafos’, publ. Madrid
Lopez L, 1890. ‘Catalogo Descriptivo del los Sellos de Correos de Espana y sus Colonias’ (organised in accordance with the Historical-Descriptive Report and published by Royal Decree and under the direction of Antonio Fernandez Duro) 2nd edition, publ. Madrid.
Lopez L, 1892. ‘Catalogo Descriptivo del los Sellos de Correos de Espana y sus Colonias’ 3rd edition, publ. Madrid. (For later editions see Galvez)
Mencarini J, 1896. ‘Catálogo Descriptivo de los Sellos y Tarjetas Postales de las Islas Filipinas’, publ. Manila.
Minondo J, 1906. ‘Catalogue de Timbres-Poste et Télégraphe de Espagne et
Colonies de la Société Philatelique Internationale de San Sebastian’,
publ. San Sebastian (in French with Spanish preface)
Tarre, F del. ‘Catálogo Tarjetas Postales España, Colonias, Ex-Colonias, Emitidas Hasta 1920’, 2nd Ed. Edición Facsimíl 1973.
Vives A, 1897. ‘Catálogo de los Sellos de Correos y Telégrafos de España y Colonias’, publ. Madrid.
Bartels J, Foster F and Palmer F, 1904. ‘Postage Stamps of the Philippines’. Boston.
Hanciau L, 1905. “The Postal Issues of the Spanish Colony of the Philippines”. Stanley Gibbons Monthly Journal (December 30, 1905). London.
Harradine, P, 1987. “Philippine Postage Stamp Handbook, 1854—1982”. Jefferson, NC and London.
Higgins & Gage, 1979. "World Postal Stationary Catalog", 2nd edition, eds. Gage A & Fladung E, California; Classics Philatelics
Littrel, R (ed.) 2010. “Postal
Cards of Spanish Colonial Cuba, Philippines and Puerto Rico”. United
Postal Stationery Society, Inc.
Mekeel, 1895. Mekeel’s Complete Standard Catalogue of the Postage Stamps of the World. C.H. Mekeel Stamp and Publishing Company, St Louis, MO USA.
Palmer F, 1912. “The Postal Issues of the Philippines”, New York.
Palmer, M. 2023. Spanish Philippines - Alfonso XIII 1890 to 1897 Specialised Catalogue Constant Plate Flaws (Key Varieties). Spanish Philippines - Alfonso XIII 1890 to 1897 Specialised Catalogue
Peterson, D and Lewis, G, 2000. "Postal History of the Spanish Philippines 1565-1898", publ by Don Peterson.
Schenkel F, 1900. “Philippine Postage Stamps – Wholesale only” Manila.
Belin M, 1898. ‘Catalogue Belin. Catalogue Descriptif Illustre’, 9th edition, publ. Maurice Belin, Brussels.
Belin M, 1899. ‘Catalogue Belin. Catalogue Descriptif Illustre’, 10th edition, publ. Maurice Belin, Brussels.
Champion, 1892. ‘Catalogue Champoin Catalogoue complet descritif de tous le timbers-postes, telegraphes et entiers, indiqquant la valeur de chaque timbre’, publ Geneve.
Yvert et Tellier, 1897. ‘Catalogue prix-courant de timbres-poste’, 1st edition publ. Amiens.
Yvert et Tellier-Champion, 1922. ‘Catalogue prix-courant de timbres-poste’, 26th edition, publ. Amiens.
Yvert et Tellier, 2005. ‘Catalogue Mondial de cotation, Classiques du monde, 1840-1940’, publ. Amiens.
Yvert et Tellier, 2009. ‘Catalogue de cotation des Timbres d’Outre-Mer de O à S’, publ. Amiens.
Yvert et Tellier, 2015. ‘Catalogue Mondial cotation, Timbres d’Asie Extreme-Orient’, publ. Amiens.
Yvert et Tellier, 2020. ‘Catalogue Mondial cotation, Timbres d’Asie Extreme-Orient’, publ. Amiens.
Friederich R, 1894. ‘Die Postwertzeichen Spaniens und seniner Kolonien’, publ. Berlin.
Michel Übersee-Katalog, Südostasien 40th edition 2015, Volume 8.2, Schwaneberger, Germany (2014)
Anon, 1998. Reader’s Questions - Souvenir of the Peace Jubilee / Washington D.C. May 23, 24, 25, 1899 Cancellation on 2-4/8c Baby Head Issue. IPPS Newsletter, vol 18
Anon, 1892. New Issues and unchronicled varieties. London Philatelist vol 1 no 8, p224.
Anon, 1894. New Issues. London Philatelist vol 3 no 27, p77.
Anon, 1894. New Issues. London Philatelist vol 3 no 36, p302.
Anon, 1897. New Issues. London Philatelist vol 6 no 67 (July), p225.
Anon, 1897. New Issues. London Philatelist vol 6 no 70, p300.
Anon, 1897. New Issues. London Philatelist vol 6 no 71, p332.
Agustin, S. 1991. Printing Inks King Alfonso XII and XIII stamps. International Philippine Philatelic Society Newsletter Newsletter, 2nd Quarter
Agustin, S. 1992. Correspondence on 1/8c Newspaper Stamp with ‘Correos’ Heading on Sheet. International Philippine Philatelic Society Newsletter, vol 12 no. 1, p 5.
Agustin A., & Peterson, D. 1991. Bogus Muestra” Overprinted King Alfonso XIII Stamps of 1898. Philippine Philatelic Journal, vol 13, no.1, pp5-7.
Agustin, S., Peterson, D. & Brett, GW. 1993. Plate flaw on 6c brown-violet babyhead issue of 1892. Philippine Philatelic Journal, vol 15 no.3, pp 1-4.
Alvarado, L. 1977. The Alfonso
XIII Issues for Puerto Rico. Puripex '77 Souvenir Book. Sociedad
Filatelica de Puerto Rico, September 2 - 5, pp 221-230.
Castro, K., Abalos, B., Martinez-Arkarazo, I., Etxebarria N. & Madariaga, JM. 2008. Scientific examination of classic Spanish stamps with colour error, a non-invaisve micro-Raman and micro-XRF approach: The King Alfons XIII (1889-1901 “Pelon”) 15 cent definitive issue. Journal of Cultural Heritage vol 9, pp 189-195.
Encarnacion, E. 1986. National Philatelic Treasures. Philippine Philatelic News, vol. 8 Special Edition, pp 23-46.
Encarnation, E. 2011. Philippine Telegraphs, Spanish Colonial Period 1864-1896. Philippine Philatelic Journal, vol 33 no. 1, pp 28-30.
Griffin, R. 2004. Phun with the Philippines – Phabulous Phind. Philippine Philatelic Journal, vol. 26 no. 1, pp 5-11.
Gooding, N. 2008. Spanish-Philippine Errors [1871-1897]. Philippine Philatelic Journal, vol 30, no. 2, pp 21-23
Gooding, N. 2017. Agencia Editorial Manuel Arias Y Rodriguez. Philippine Philatelic Journal, vol. 38 no. 1, pp 41-46.
Harlan, E. 2000. Reader’s Questions - Souvenir of the Peace Jubilee / Washington D.C. May 23, 24, 25, 1899 Cancellation on 2-4/8c Baby Head Issue. IPPS Newsletter, vol 20 no. 1, p 9.
Harradine, P. 1975. The Tapling
Collection. Philippine Philatelic Society Journal, vol 1 no.2 pp 19
- 27
Harradine, P. The
'Baby Face Issues' of Alfonso XIII. Philippine Philatelic Society
Journal, vol 2 no. 3 p 5.
Harradine, P. 1979. Spanish 'Officials' Used in the Philippines? Philippine Philatelic Society Journal, vol. 4 no. 3, pp 11-15.
Lang-Valchs, G. 2022. Philippine Philatelic Jokes. Philippine Philatelic Journal, vol 44 no. 3, pp 12-19.
Lurch, N. 1987 ‘Notes on Spain and Colonies Postal Cards.’ Postal Stationery, Journal of the United Postal Stationery Society, vol 29:2, pp 23-26.
Palmer, M. 2013. Distinguishing Flaws in the 1892, King Alfonso XIII, 6c brown violet (Scott #157) stamp. Philippine Philatelic Journal, vol 35 no. 1, pp 5-14.
Palmer, M. 2013. King Alfonso XIII, the 1892 to 1894 issues of cliché Type II: 2c claret (Scott #144), 2c violet (#145) and 2c dark brown (#146). Philippine Philatelic Journal, vol 35 no. 3, pp 16-20.
Palmer, M. 2014. King Alfonso XIII, Scratches on the 2 4/8 c dull blue (Scott #149), and 2 4/8 c olive grey #150). Philippine Philatelic Journal, vol 36 no. 1, pp 28-30.
Palmer, M. 2015. Cliché types in the Babyhead Issues. Philippine Philatelic Journal, vol 37 no. 1, pp 32-34.
Palmer, M. 2015. Blind Perforations Babyhead Issues. Philippine Philatelic Journal, vol 37 no. 4, pp 5-7.
Palmer, M. 2017. In Search of the 1891 10c Pale Claret. Philippine Philatelic Journal, vol 39 no. 4, pp 22-24.
Palmer,
M. 2018. Paper Types in the
1890-1897 Alfonso XIII Baby Head Series. Philippine Philatelic
Journal, vol 40 no. 2, pp 26-29.
Palmer, M. 2019. Constant Flaws in the 1891-1897 Babyhead issues – an update. Philippine Philatelic Journal, vol 41 no. 3, pp 5-11.
Palmer, M. 2019. Plating of the 1892-1896 Postal Cards. Philippine Philatelic Journal, vol 41 no. 4, pp 5-9.
Palmer, M. 2022. Clarifications for the 1897 1c claret and description of a new Gum Type. Philippine Philatelic Journal, vol 44 no. 1, pp 20-23.
Palmer, M. 2023. An ingenious forgery of the "1892 5c violet black" stamp. Philippine Philatelic Journal, vol 45 no. 3, pp 16-21.
Palmer, M. 2023. The 1892/1893 20c grey brown (Scott #174) issue. Philippine Philatelic Journal, vol 45 no. 4, pp 14-16.
Peterson, D. 1983. Identification of the 1894 and 1896 Grey-Brown 2-centavos Philippine Issue. Philippine Philatelic Society Journal. vol 7 no. 2, pp 11-14.
Peterson, D. 1984. The Two
Designs of the 1890 - 1897 Philippine 'Babyhead' Issue. The
Collector's Club Philatelist, vol 63 no. 1, pp 17-20.
Peterson, D. 1985. Rare Diagonal
Gum Found on 1890 Newspaper Issue. Philippine Philatelic Society
Journal, vol 8 no. 2, p 13.
Peterson, D. 1985. Gums of the 1890 - 1897 Philippines Issue and
Comments Regarding the Listings in the Scott Catalogue. Philippine
Philatelic Society Journal, vol 8 no. 3, pp 9-12.
Peterson, D. 1986. Scott numbers
184 and 186 ... Two Surcharged Issues that Aren't What They Seem.
Philippine Philatelic Society, vol 9 no. 3 & 4, pp 11-13.
Peterson, D. 1988. The First Month of Issue of the 1897 Surcharged Stamps. Philippine Philatelic News, vol 10 no. 1, pp 1-2.
Peterson, D. 1988. Four-In-One: The 5c Green Issue of 1892. Philippine Philatelic News, vol 10 no. 1, pp 2-4.
Peterson, D. 1988. Specimens of the Spanish Philippines. Philippine Philatelic News, vol 10 no. 2, pp 1-8.
Peterson, D. 1988. Registration Handstamps of the Spanish Philippines, Part 1. Philippine Philippine Philatelic News, vol 10 no. 4, pp 19-20
Peterson, D. 1989. Registration Handstamps of the Spanish Philippines, Part 2. Philippine Philippine Philatelic News, vol 11 no. 1, pp 7-9
Peterson, D. 1989. Reprints of the 1897 Surcharged Issue. Philippine Philatelic News, vol 11 no. 2, pp 1-4.
Peterson, D. 1989. Major Errors of the Spanish Philippine 1890-1897 Issue. Philippine Philatelic News, vol 11 no. 4, pp 4-10.
Peterson, D. 1990. Specimens of the Spanish Philippines – Update. Philippine Philatelic News, vol 12 no. 4, pp 6-9.
Peterson, D. 1991. Essays, Proofs and Imperforates - Point of Clarification. Philippine Philatelic Society Journal. vol 13, no. 1, pp 3-4.
Peterson, D. 1993. New Spanish Philippine 'Muestra' Variety Discovered, Up-dated List of Genuine 'Muestra' Types, and Descriptions of Known 'Muestra' Forgeries. Philippine Philatelic Journal, vol 15 no 4, pp 1-7.
Peterson, D. 1995. Eleventh Major Error Reported of the Spanish Philippine 1890-1897 Issue. Philippine Philatelic Journal, vol 17 no. 4, pp 16-17.
Peterson, D. 1996. Updated Description of Spanish Philippine ‘CERTIFICADO’ Handstamp Types’. Philippine Philatelic Journal, vol 18 no. 1, pp 14-19.
Peterson, D. 1997. Twelfth Major Error Reported of the Spanish Philippine 1890-1897 Issue: Scratched Plate Flaw on Three Scott #150 Positions. Philippine Philatelic Journal, vol 19 no. 4, pp 18-19.
Peterson, D. 1998. The Two Designs of the 1890-1897 Philippine “Babyhead” Issue. Philippine Philatelic Journal, vol 20 no. 1, pp 18-21.
Peterson, D. 1998. Reader’s Questions - Souvenir of the Peace Jubilee / Washington D.C. May 23, 24, 25, 1899 Cancellation on 2-4/8c Baby Head Issue. IPPS Newsletter, vol 18 no. 3, pp 12-13.
Peterson, D. 1999. List of forgeries and their references of Spanish Philippines postal stamps. Philippine Philatelic Journal, vol 21 no. 1, pp 1-12.
Peterson, D. 1999. Updated list of Spanish Philippine Specimen (MUESTRA) Types. Philippine Philatelic Journal, vol 21 no. 2, pp 5-11.
Peterson, D. 1999. First and Second Printings of the 1890-1896 Postal Issues. Philippine Philatelic Journal, vol 21 no. 3, pp 9-15.
Peterson, D. 1999. Overseas Circular Rate. Philippine Philatelic Society Journal (England), vol 19, 1999 no. 1, p5.
Peterson, D. 2000. Revision: First and Second Printings of the 10c Pale Claret Postal Issue (Scott #164). Philippine Philatelic Journal, vol 22 no. 2, pp 21.
Peterson, D. 2002. from the Collection of Don Peterson - Registered Postal Card, Interior Rate. Philippine Philatelic Society Journal, Volume 21, no 1, p 5.
Peterson, D. 2002. from the
Collection of Don Peterson - Overseas Mail, Per First Mail.
Philippine Philatelic Society Journal, Volume 21, no 2, p
5.
Peterson, D. 2003. Revised Table
XIII-1 on Postal Rates in Peterson and Lewis (2000). IPPS
Newsletter, Volume XXIII, no 3, pp 12-13.
Peterson, D. 2004. from the
Collection of Don Peterson - Overseas Mail Dotted Star Cancel.
Philippine Philatelic Society Journal, Volume 23, no 2, p
8.
Peterson, D. 2004. Two new reprints discovered of the Spanish Philippines 1897 Surcharged Issue. Philippine Philatelic Journal, vol 26 no 3, pp 19-20.
Peterson, D. 2005. Unusual Printings and Other Odd Ball Variations of the 1890s Issues. Philippine Philatelic Journal, vol 27 no 1, pp 4-7.
Peterson, D. 2005. Essays and Proofs of the Spanish Philippines. Philippine Philatelic Journal, vol 27 no 2, pp 7-16.
Peterson, D. 2005. The Contributions of Warren A Browne to Philippine Philately. Philippine Philatelic Journal, vol 27 no 2, p 19.
Peterson, D. 2005. Circular and Newspaper Rates and Procedures of the Spanish Philippines, 1854-1898. Philippine Philatelic Journal, vol 27 no 4, pp 3-13.
Peterson, D. 2006. Earliest Reported Postmark for the 1897 Issues. Philippine Philatelic Journal, vol 28, no. 4, pp 18.
Peterson, D. 2007. Scott #144 – Sheet of Second Printing Quite Revealing. Philippine Philatelic Journal, vol 29, no. 2, pp 24-25.
Peterson, D. 2007. Scott #145 – A Nearly Full Sheet Discovered. Philippine Philatelic Journal, vol 29 no. 3, pp 29-30
Peterson, D. 2008. Three 1890-1897 8 Centavos Issues. Philippine Philatelic Society Journal, vol 27 no. 2, p10.
Peterson, D. 2008. Does a 5-Centavos Violet Black ‘Babyhead’ Issue Exist? If So, Is It Rare?. Philippine Philatelic Journal, vol 30 no. 3, pp 24-28.
Peterson, D. 2008. Philatelic Souvenir Of the Peace Jubilee, Washington DC, May 23-25, 1899. Philippine Philatelic Journal, vol 30 no. 4, p 7.
Peterson, D. 2009. Scott #141 – The 1 Centavo Rose Stamp Was Issued in 1894. Philippine Philatelic Journal, vol 31 no. 3, p 15.
Peterson, D. 2010. The Confusing 20c ROSE and 20c SALMON 'Babyhead' Issues. Philippine Philatelic Journal, vol 32 no. 1, pp 7-9.
Peterson, D. 2011. Updated Postal Rates of the Spanish Philippines, 1879-1898. Philippine Philatelic Journal, vol 33 no. 2, pp 6-7.
Peterson, D. 2011. Perf 101 Perforations of the Spanish Philippine Period. Philippine Philatelic Journal, vol 33 no. 3, pp 22-24.
Peterson, D. 2011. Scott #147 – A Significant Departure in the “Normal” Sheet Configuration. Philippine Philatelic Journal, vol 33 no. 4, pp 12-13.
Peterson, D. 2012. Spanish Philippine Sheet Configurations, 1854-1898. Philippine Philatelic Journal, vol 34 no. 2, pp 25-29.
Peterson, D. 2014. Earliest Reported Postmark of 1897 Surcharged Issue - Update. Philippine Philatelic Journal, vol 36 no. 1, p 10.
Peterson, D. 2014. Two plating errors on Scott #P1 Sheet Margin Imprints. Philippine Philatelic Journal, vol 36 no 2, pp 37-37.
Peterson, D. 2014. Used blocks of the 1890-1896 Postal Issues: a Great Discovery or what? Philippine Philatelic Journal, vol 36 no 3, p34.
Peterson, D. 2015. Philippine Imperforate Proofs, Examples of 1890-1897 Postal and Newspaper Stamps. Philippine Philatelic Journal, vol 37 no. 4, pp 10-11.
Peterson, D. 2016. Manila-Dagupan Railway Post Office Cancels During the Spanish Period. Philippine Philatelic Journal, vol 38 no. 2, p 38.
Peterson, D. 2017. Scott #172 and #173 Merged in 2017 Scott Catalogue. Philippine Philatelic Journal, vol 39 no. 1, pp 20-21.
Peterson, D. 2017. Extraordinary Gems 1890-1896 Issues Small Die Colour Proofs (illustration). Philippine Philatelic Journal, vol 39 no. 4, p21.
Peterson, D. 2019. Reprints of the 1897 Surcharged Issues. Philippine Philatelic Journal, vol 41 no. 1, pp20-23. (Note comments and observations on this article provided by pers comm. Feb 2019)
Peterson, D. 2019. Scott #153 – Four Different Printings of the 1890’s Green 5 Centavos, Spanish Philippine Postal Issues. Philippine Philatelic Journal, vol 41 no. 4, pp20-24.
Peterson, D. & Gooding, N. 2007. ‘Gutter Pairs of the 1890 – 1898 Issues’. Philippine Philatelic Journal, vol 29 no. 1, pp 19-20.
Peterson, D. & Palmer, M. 2019. Sheet Format Types of the Spanish Philippine 1890-1898 Postal and 1886-1896 Newsparer Issues. Philippine Philatelic Journal, vol 41 no. 3, pp 27-33.
Preube, C. 2023. The first day of the Babyhead stamps. Philippine Philatelic Journal, vol 45 no. 4, pp 18-20.
Sim, T. 2013. Foreruners of the Dagupan & Manila Railway Post Office (R.P.O). Philippine Philatelic Journal, vol 35 no. 1, pp 24-29.
Warren, A. 2003. Philippine Local Postage Stamps of 1898 Issued by the Municipal Government of San Fenando. La Union Province. Philippine Philatelic Journal, vol 25 no. 3, pp 1-11.
Weber, F. 1963. Variety on 2m Newspaper Stamp. American Philatelist, vol 76, p 263.Gaceta de Manila, Vol. XXIV, 10 November 1884.
Gaceta de Manila, Vol. XXX, 2 February 1890.
Gaceta de Manila, Vol. XXX, 15 July 1890.
Gaceta de Manila, Vol. XXX, 23 September 1890.
Gaceta de Manila, Vol. XXXI, 15 March 1891.
Gaceta de Manila, Vol. XXXI, 1 July 1891.
Afinsa. (1995). XXX Substata Filatelica. Afinsa Auction Catalogue, 30 March 1995.
Afinsa. (1999). Substata Internacional. Afinsa Auctions in conjunction with Soler y Llach Auction Catalogue, 14 December 1999.
Afinsa. (2001). Substata Internacional, Filipinas. Afinsa Auctions in conjunction with Soler y Llach Auction Catalogue, 30 October 2001.
Afinsa. (2002). Substata Publica Colonias Espanolas. Afinsa Auctions in conjunction with Soler y Llach Auction Catalogue, 22 May 2002.
Antonio Torres. (1991). “Gran Subasta de Filipinas”. Antonio Torres in conjunction with Galeria Filatelica de Barcelona Auction Catalogue, 31 January 1991
Carl Pelander. (1948). Philippines, The Ferrar H Tows Collection Part II, Carl Pelander Auction Catalogue 10, 11, 12, & 13 November 1948, New York.
HR Harmer. (2017). Sale 3014 The Richard D. Miggins Collection of The Philippines, 2 June 2017
HR Harmer. (2020). Sale 3034 The Julian Cabarris Collection of the Philippines, 7 August 2020
HR Harmer. (2021). Sale 3046 The Don Peterson Collection of Spanish Philippines 1872-1898, 25 June 2021
Heinrick Kohler. (2008). Spain and Latin America. 332nd Heinrich Koehler Auction Catalogue, 13 & 14 March 2008 in Wiesbaden.
Heinrick Kohler. (2008). 334th Heinrich Koehler Auction Catalogue, 23 to 27 September 2008 in Wiesbaden.
Philstamps. (1988). Stamps and Covers of the Philippines. Philstamps Mail Auction 488 Catalogue, 21 May 1988, California.
Philstamps. (1988). Stamps and Covers of the Philippines. Philstamps Mail Auction 1188 Catalogue, 26 November 1988, California.
Philstamps. (2010). William F Oliver Collection - Part 1. Philstamps Auction 1110 Catalogue, 10 December 2010, California.
Philstamps. (2011). William F Oliver Collection - Part 2. Philstamps Auction 611 Catalogue, 28 July 2011, California.
Philstamps. (2012). William F Oliver Collection - Part 3. Philstamps Auction 412 Catalogue, August 2012, California.
Philstamps. (2014). Philstamps Auction, December 2014.
Philstamps. (2015). Philstamps Auction, November 2015.
Soler y Llach. (1992). Filipinas Emisiones de Isabel II. Soler y Llach Auction Catalogue, 20 February 1992. [collection of Fritz-Walter Lange]
Soler y Llach. (2006). Subasta Publcia Espana Y Ex-Colonias. Soler y Llach Auction Catalogue, 14 March 2006.
Soler y Llach. (2018). Subasta Publcia Espana Y Ex-Colonias. Soler y Llach Auction Catalogue, 16 October 2018.
Soler y Llach. (2021). Subasta Publcia Espana Y Ex-Colonias. Soler y Llach Auction Catalogue, 23 February 2021.
Soler y Llach. (2021). Subasta Publcia Espana Y Ex-Colonias. Soler y Llach Auction Catalogue, 3 November 2021.
Soler y Llach. (2022). Subasta Publcia Espana Y Ex-Colonias. Soler y Llach Auction Catalogue, 18 May 2022.
Soler y Llach. (2022). Subasta Publcia Espana Y Ex-Colonias. Soler y Llach Auction Catalogue, 18 October 2022.
Other Background References not directly related to the Philippine Babyhead Issues
Bourman J R, 1898 ‘Anuario Filatelico de Espana Y Colonias’, publ. I Casapalma, Malaga
Minondo J, 1902. ‘Catálogo de los Sellos de España 1850 a 1901’ publ. San Sebastian (also editions of 1903 and 1905).
London Philatelic Society. 1879.
Catalogue of Postage Stamps, Stamped Envelopes, and Postcards of Spain
and Colonies. London. pp 43 - 47.
Robson Lowe Ltd. (1964). The Burrus Collection, Portugal and Philippines. Robson Lowe Ltd Auction Catalogue, 5 May 1964, London
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