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What kind of "book" is it if next to book type it says " other"? There arekindles, hardcover, e-books, and paperback but I don't know what "other" is. Someone please tell me.
Plastic comb is a round form of binding (like spiral) where plastic teeth fit into the pages. There's a photo here: http://www.bookbindingpros.com/book-binding-types.htm
Library binding is usually a more durable form of binding or rebinding, to help a book hold up in a library setting. It generally involves the use of a hardcover binding (even if the book was originally softcover), strengthening the spine, sewing the pages, etc.
If you're in doubt about ordering a particular item, PM the sender beforehand and ask.