426 copies. How many new books are known by numbers? The method is to subtract the first number from the last number and add 1. If the number is from 325 pages to 750 pages, you can get 426 new books. A library is an institution that collects, sorts out and collects books and materials for people to read and refer to. As early as 3000 BC, libraries appeared. Library has the functions of preserving human cultural heritage, developing information resources and participating in social education.