ISBN 9634505909 hat failed the check­sum digit test.
The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 9634505909 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: former U.S.S.R
ISBNas­su­med er­rorCatalogs for checking
5-634-50590-9first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Netherlands
ISBNas­su­med er­rorCatalogs for checking
94-345-0590-9second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Greece
ISBNas­su­med er­rorCatalogs for checking
960-450-593-93rd and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Hungary
ISBNas­su­med er­rorCatalogs for checking
963-350-590-9fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-420-590-9fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-450-530-9eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-450-590-2tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-450-592-9ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-450-690-9seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-450-950-97th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
963-453-590-9sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Israel
ISBNas­su­med er­rorCatalogs for checking
965-430-590-93rd and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Pakistan
ISBNas­su­med er­rorCatalogs for checking
969-450-590-9third digit was chan­ged. amazon.co.uk amazon.com amazon.de

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