Bookfinder, a book shopper's search engine, has on its search form a box for the ISBN. The ISBN, to be found on many books' copyright pages (especially in newer books), is a book identifier number booksellers use. It can also be found on the book's back cover; it comes in both 10- and 13-digit lengths.
The ISBN can be used by itself on Bookfinder's search form; and, most other book shopping sites have the feature.
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