Books in the library are usually stamped on the first page. Generally, the first collector who stamps a book will stamp it in the blank below the first line from the right; If there is no space under the first line, move to the left to the second line. In the second line, the bibliophile seals the blank space above the seal of the previous bibliophile. If there is no space above it, move one line to the left and stamp it at the bottom of this line, and so on. If there is no blank space under the book, move to the blank space above the second line of the page (the first line is often occupied by the title); If there is still no space, either cover it on the next page or cover it on the printed font of the book.