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First Scott catalog debuts, published by John Walter Scott
The 48th edition of the Scott catalog became the first to assign catalog numbers to stamps
Last catalogue year for which an edition was not published
Publication of the 1923 U.S. Specialized Catalogue (the first edition)
Publication of the 1939 Catalogue, first edition in which illustrations of U.S. stamps were allowed to be shown in their entirety
Publication of the 1940 Catalogue, where a large-scale renumbering occurs with the numbering system for back-of-the-book items becomes alpha-numeric
Publication of the 1942 Catalogue, the last edition to have all of the stamps listed in just one volume
Publication of the 1971 Catalogue, the last edition where Volumes 1 and 2 were available bound together in one combined edition
Publication of the 1972 Catalogue, the first edition comprised of three volumes
Publication of the 1973 Catalogue, the first to contain advertising from philatelic firms besides Scott
Publication of the 1981 Catalogue, the first to have any text stored in a computer
Relocation of Scott offices from New York City to Sidney, Ohio
Publication of the 1989 Catalogue, the first to have all text information stored in a computer, which brought about a change in size of the printed catalogue page to their current dimensions
Publication of the 1995 Classic Catalogue of Stamps of the World 1840-1940
Publication of the 1996 Classic Catalogue, the first edition with specialized information included
Shift to all color stamp images in the print catalogs
Each volume of the worldwide Scott Standard Postage Stamp Catalogue was divided into two-book sets
New Scott digital catalog launched with goal of picturing every stamp of the world
Scott catalog and Scott Stamp Monthly editor-in-chief
Scott catalog editor emeritus
Scott catalog editor-at-large
Scott catalog new issues editor
Scott Stamp Monthly managing editor
Scott catalog contributing editor and Scott Stamp Monthly senior editor