On the first day April (Gengshen to), April 24, 1800, the Library of Congress was established. In In April, 1800, as the U.S. government moved to Washington from Philadelphia, John Adams, the second president of the then approved the purchase of a value of $ 5,000 (at the time is a huge expenditure) books to Members of need. Library of Congress, this was proclaimed. Later, in 1814 and 1851 fire, Collection 2/3 of the rare books burned. 1870 to 1980, with the growing collection of books, the Library of Congress has experienced three times New expansion. Now the Library of Congress is not the initial reference service only Congress Library, but the world's largest library. 22 reading 115 million of collections (including around 20 million books), bookshelf total length of 860 km, the 31000 collection has added daily, there are a large number of occasional donations. Library staff in 5000, about 900 people work directly for the House and Senate. (History. Cn)