Also, use Princeton boxes in place of any cardboard boxes that you happen to find when shelving. If books must be stacked flat, be certain that they are stacked no more than three or four high. If a book is too tall, shelve it on its spine. Handle books with clean hands. Keep food, drink and tobacco away from books.
Support covers of open books.
Do not force books to open more than they will easily open. Position enclosures near the center of the book, not near joint. Do not use paper clips in text. Bring damaged or brittle books to the attention of the library staff. Do not force books into a cramped area.