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Learn About ISBNs


Most books published after 1969 have an ISBN (International Standard Book Number). It is most easily found on the back of books (with or without a barcode).


The 10 and 13-digit variants both work on our site, but UPCs (12 digits, sometimes on the back around the bar code) do not work. Some books only list their ISBN on the copyright page (a few pages into the book). A handful of books (mostly published in 1968/69) have a 9-digit “SBN”. Those will work, too.

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