Sources from over 200 world’s fairs and expositions, with emphasis on 9: the 1851 Great Exhibition of the Works of Industry of All Nations (London); the 1876 Centennial International Exhibition (Philadelphia); the 1889 Exposition Universelle (Paris); the 1893 World’s Columbian Exposition (Chicago); the 1904 Louisiana Purchase Exposition (St. Louis); the 1915 Panama Pacific International Exposition (San Francisco); the 1933/1934 Century of Progress International Exposition (Chicago); the 1939/1940 New York World’s Fair; and the 1967 Expo ’67 (Montreal). Includes a wide range of document types, such as posters, books, scrapbooks, maps, pamphlets, periodicals, correspondence, diaries, photographs, postcards, sheet music, sound recordings, catalogs, souvenirs, organizational records, and more.