1, in order to ensure that the newly purchased books are not duplicated with the previous ones, it is generally necessary to "double check" first-remove the original books to be newly ordered in the order.

2. Find out what new books the publishing house has through various new book catalogues.

34 million copies should include books, audio-visual materials, microfilms, and bound volumes of periodicals. There are definitely no real paper books. 4 million is the total number of books-libraries usually buy 2-3 books of each kind, so there are only hundreds of thousands of books in 4 million books.

At present, more than 300,000 kinds of books (including reprints) are published in China every year. Therefore, 4 million volumes are far from containing all the books, but only a small part of "all the books at present".