国会图书馆里大约有一亿一千九百万本书、地图、照片、录影带、音乐记录、数位资料，以及其他资料

出处: Source unknown. "Construction of the Library of Congress, Washington, D.C., April 19, 1893." 1893 April 19. Taking the Long View: Panoramic Photographs, 1851-1991, Library of Congress.