surface. Specialists have also identified 14 different weights and grades of paper used on the stamps. As a result of the collecting challenges, the Exporta issue has received a great deal of attention by collectors and is the most popular modern series. Ronald Hill, "Who Put That Big Red Tomato On That Little Bitty Stamp?" The Mexico Exporta Definitives John R. Endsley,Jr., A Comprehensive & Specialized Catalogue of the Exporta Issues of Mexico See Checklist of Exporta Definitives in Pulver pp. 103–107. See Michael D. Roberts, A Bibliography for the Exporta, Mexicana, vol. 57, no. 3, p. 121 (July 2008). See James O. Vadeboncoeur, The Exporta Issue of Mexico. See etiangui ( Enrique Sanchez Garcia ) "The Mexico Exporta serie, complete classification guide" Twenty-first century In 2005, a Mexican stamp issue, part of a series commemorating Mexican cartoons, was the subject of widespread media attention. The issue of five stamps depicting Memin Pinguin, a poor Cuban-Mexican boy from a popular comic book, came under fire, primarily from those outside Mexico, as being a racist stereotype. The stamps received support from many in Mexico who contended the cartoon was culturally acceptable and not viewed as racially offensive. Mexican president Vincente Fox supported the stamp suggesting that critics did not understand the beloved character. Collecting Mexican stamps Mexico is popular among philatelists particularly for its classic issues with their complex use of district overprints and invoice numbers, as well as the variety of cancellations used. The postal cancellations used on Mexico's classic period stamps have been very popular among philatelists and have been the subject of extensive study. As stated by Schatzkès & Schimmer, "Amongst the collections of cancellations, Mexico is pre-eminent. No other country possesses such a remarkable selection of ornamental cachets of unusual dimensions and of an extraordinary variety." Other areas that have received extensive philatelic attention are Mexico's pre-stamp postal markings, the issues of the Mexican Revolution (1913–1916), and the modern Exporta issue (1975–1983), with its complex variety of papers, sizes, perforations and watermarks. James H. Beal stated that "few will doubt that any single country's issues raise more and vaster questions, require more care in the avoidance of pitfalls, or more defy neat solutions, than the stamps of Mexico." Forgeries Most of the classic issues of Mexico have been forged, primarily for the philatelic market, and numerous cancellations and district overprints have also been faked. In the early