ISBN 9635034934 hat failed the check­sum digit test.
The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 9635034934 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
5-635-03493-4first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Netherlands
ISBNas­su­med er­rorCatalogs for checking
90-356-3493-42nd and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
94-350-3493-4second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Hungary
ISBNas­su­med er­rorCatalogs for checking
963-403-493-4fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-503-433-4eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-503-493-8tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-503-495-4ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-503-593-4seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-504-493-36th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
963-506-493-4sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
963-583-493-4fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Iran
ISBNas­su­med er­rorCatalogs for checking
964-503-393-43rd and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Pakistan
ISBNas­su­med er­rorCatalogs for checking
969-503-493-4third digit was chan­ged. amazon.co.uk amazon.com amazon.de

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