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ISBN 9780691054322 is numerically correct. You can now test if if corresponds to an actual book.

Detected correct ISBN-13

The ISBN 9780691054322 that you input was checked and found numerically correct. This only means that is 13 digits long and has got the correct check digit so there cannot be an error in a single digit (some transpositions are caucght by the check digit calculation, some are not. It does not signify that the ISBN was assigned ever to a book A way to check this is searching the following book sites: amazon.de (Germany), amazon.co.uk (UK) und amazon.com (USA). To the home page Diese Seite auf deutsch
Tiu ĉi paĝo en Esperanto (Unikodo)
Tiu cxi pagxo en Esperanto (x-igata)

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