ISBN
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The ISBN as printed on the item. We do not use this field for numbering systems other than ISBN. If both ISBN 10 and ISBN 13 are listed, they are separated with a semi-colon. Example: "978-0-307-29063-2; 0-307-29063-8". A SBN, the 9-digit predecessor of ISBN, can also be entered, but it needs to be a valid one SBN.