Usually the your books ISBN number or International Standard Book Number can be found on the rear cover near the bottom. But if the book is a hard cover the ISBN number may be on the inside back cover near the bottom of the book.
Keep in mind if the book was made before the 1970's it may not have an ISBN number.
If you own an older book which you may think may be valuable, would pay to get advice from a professional old and vintage book merchant.
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