The book can copy when use it to right click the full chiseled bookshelf.

Use the book or enchanted book to right click the full chiseled bookshelf, player can obtain a new same book. For example, I use an enchanted book to right click the full bookshelf, my book count is became 2 and the new enchanted book can use for enchant. I also try to use 64 book, it became 65 or higher!