It is difficult to determine exactly how many pieces of library material are added to the collection of the Library of Congress on a daily basis, as the collection is constantly growing and changing. However, the library receives thousands of new items every year, including books, manuscripts, photographs, maps, and other types of library materials. The library also acquires digital content, such as electronic books and digital versions of manuscripts and other rare materials.
In addition to acquiring new materials through purchases and donations, the library also adds items to its collection through its copyright deposit program. Under this program, the library is required to receive a copy of every book, pamphlet, map, print, and other work that is published in the United States. This helps to ensure that the library’s collections are comprehensive and up-to-date, and it allows the library to serve as a national repository of the intellectual and cultural heritage of the United States.