國會圖書館裡大約有一億一千九百萬本書、地圖、照片、錄影帶、音樂記錄、數位資料，以及其他資料

出處: 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.