The books in the library are classified according to the China Library Classification. I don't know whether you want to find books in the school library or the public library. It's basically the same. If there are computer retrieval conditions, you can find the request number or classification number of each book. Generally, there are classified indexes on bookshelves. After finding the big category, look at the label on the back of each book. Bookmarks are divided into two parts, the first part is classification, and the second part is serial number. Each library has a different method. Here, we arrange it according to the author's four-corner number, that is, the four digits from big to small. The order of looking for books is generally from left to right and from top to bottom. Look at the request number carefully and you will find it soon. No more, let the administrator help. They are very familiar with where the book is