ISBN 0961821004 hat failed the check­sum digit test.
The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 0961821004 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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ISBN prefix group: English language
ISBNas­su­med er­rorCatalogs for checking
0-06-182100-4second digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-901821-00-4third digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-9608211-0-44th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-9610210-0-4fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-9618012-0-46th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-9618200-0-4seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-9618210-0-0tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-9618210-9-4ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-9618216-0-4eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-9628210-0-4fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-9648210-0-14th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-9681210-0-44th and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Japan
ISBNas­su­med er­rorCatalogs for checking
4-9618210-0-4first digit was chan­ged. amazon.co.uk amazon.com amazon.de

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