<P> The Library received the right of transference of all copyrighted works to have two copies deposited of books, maps, illustrations and diagrams printed in the United States . It also began to build its collections of British and other European works and then of works published throughout the English - speaking world . </P> <P> This development culminated in the construction between 1888 and 1894 of a separate, extensive library building across the street from the Capitol, in the Beaux Arts style with fine decorations, murals, paintings, marble halls, columns and steps, carved hardwoods and a stained glass dome . It included several stories built underground of steel and cast iron stacks . </P> <P> The Library's primary mission of researching inquiries made by members of Congress is carried out through the Congressional Research Service, traces its origin to 1914, and was first permanently authorized (as the Legislative Reference Service) with the Legislative Reorganization Act of 1946 . </P> <P> Although the Library is open to the public, only high - ranking government officials and Library employees may check out books and materials (except through Interlibrary loan, which is available to the public (see below)). The Library promotes literacy and American literature through projects such as the American Folklife Center, American Memory, Center for the Book, and Poet Laureate . </P>

Where is the copyright office located at include the floor and room number