"Comprehensive catalogue of errors includes valuable information on: all major production errors; what to watch for; each error listed, illustrated, and valued; the latest prices; quantities known;condition, defects, and pricing variations; special section on freaks and oddities; caveats on fakes and forgeries; dealer directory; everything you need to know about error stamps."@en . "Catalogs"@en . "1998 catalogue of errors on U.S. postage stamps"@en . . "Catalogue of errors on U.S. postage stamps"@en . "Errors on United States postage stamps"@en . . . . "Errors on U.S. postage stamps"@en . . . . .