Scott's 2021 US Stamps and Envelopes Specialty Catalog.(PDF format on DVD) Scanned in PDF format. Very good quality.1478 pages,161 MB.ISBN :9780894875984 "Scott USA Specialty Catalog". Stamps and envelopes are a major reference for American collectors. stamps and postal history. The catalog also includes postal stationery, excise stamps, hunting permit stamps (duck), essays, color proofs. , Stamps and Postage Stamps, Confederate States of America, U.S. Territories and Territories, and United Nations Postage Stamps." — "New for 2021, Great Americans 1980-1999 lists now include the denominations of these popular cover stamps. Special article provides additional background information Added values for sections of modern versions from 1996 to present Panel values from earlier editions will be added to future catalog editions Many new higher values can be seen for brands high-end. These denominations are listed in Scott's stamp pricing section. — "A special article provides detailed information on the Flag Over Porch stamps from 1995-97. The article provides a table showing the costs of various stamps. The cutting configurations peak/valley of these dies, some of which are quite rare.Many important additions, changes, and corrections have been made to the Essay section.These improvements, which include many new illustrations, focus on the Classical period. For more information, please see the special article." — "The denominations of all undenominated U.S. postage stamps, beginning with the 1975 Madonna and Child Christmas stamp, are presented in a special article at the end of the catalog introduction.