Design of this stamp commemorated the Library of Congress for the services and information it provides Congress as well as to other organizations, countries, researchers, and media who use it every year. The library was created in 1800 and over the years it has grown to become the national library of the United States, serving all government branches and the public at large. It publishes the National Union Catalog, a cumulative record of books housed in 2,500 libraries in the United States and Canada. The library's collection includes more than 14 million books and 36 million manuscripts, including the personal papers of most U.S. presidents up to Calvin Coolidge. Because of its copyright function, it receives a copy of every book copyrighted in the United States.