20th century, Mexico sold the original printing plates for the 1856, 1861 and 1867 issues, as well as genuine handstamps, cancellation devices and paper to stamp dealers in the United States who made unauthorized reprints for sale to collectors. Some of the district names added in fact were fabricated and never existed. Forgeries also are common for many issues through the end of the 19th century and also the revolution and civil war period. Detailed studies of some of the forgeries include: Nicholas Follansbee, The Stamps of the Mexican Revolution 1913-1916. Fernand Serrane, Serrane Guide: Stamp Forgeries of the World to 1926, Pennsylvania, 1998, pp. 235–239, covering forgeries and reprints from 1856-1879. Roberto Liera Gutiérrez, Características de Algunas Falsificaciones de Timbres de México, covering forgeries from 1856 - c.1915. James H. Beal et al., Mexico, in James M. Chemi, The Yucatan Affair, Pennsylvania, 1980 (2d. printing), pp. 146–286, covering the extensive cancellations, district names and revolutionary period overprints forged by Raoul de Thuin Joe D. Stuart, The Counterfeits of Mexico's 1856, 1861 and 1867 Issue, Mexicana, Vol. 50, No. 1 (Jan. 2001), p. 20. Forgeries of the 1856-1867 issues illustrated José Lorenzo Cossío y Cosío. La falsificación de algunos timbres postales antiguos de México. 1932. See also List of people on stamps of Mexico References and sources Notes Sources Asociacion Mexicana de Filatelia, Tres Siglos de Filatelia en Méjico (Mexico City: Grupo Grafico Romo 2006). Extensive illustrated history of Mexican stamps. Billings, Carter and Rich Daffmer, Foreign Mail Issues of Mexico 1879-1883 (2002). R.R. Billings, Mexico - Postal Issue of 1874-1883 (1960) Samuel Chapman, Postage stamps of Mexico 1856-1868, Lawrence, Massachusetts ([1926]; reprint 1976). Leo V. Corbett, Imperial Eagles of Maximilian's Mexico, Stanton, California (1993). Nicholas Follansbee, A Catalogue of the Stamps of Mexico 1856-1900, Ashland, Oregon (1998). Nicholas Follansbee, The Stamps of the Mexican Revolution 1913-1916, Collectors Club of Chicago (1996). Roberto Liera Gutiérrez, Características de Algunas Falsificaciones de Timbres de México (2007). Dale Pulver, Introduction to the Stamps of Mexico, Linn's Stamp News, Ohio (1992). Rowe, Kenneth. The Postal History and Markings of The Forwarding Agents. (1st edition 1966, supplement 1974, 2nd ed. 1984, 3rd ed. 1996.) Scott catalog Joseph Schatzkès (rev. Karl H. Schimmer), The Cancellations of Mexico: 1856-1874, [San Antonio] (1983). Otto Yag & John K. Bash, The Pre-Stamp Postal Markings of Mexico, Elmhurst, Illinois (1965; 2nd printing 1973) Further reading Ferrer, Arturo Zavala. Catálogo de