ISBN 8085905670 hat failed the check­sum digit test.
The following 14 formally correct ISBNs were determined. Starting from these ISBNs the value 8085905670 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: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-08-590567-0first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-459-0567-0third digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-659-0587-03rd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-8095-567-04th and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-8290-567-0fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-85005-67-0fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-85905-62-0ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-85905-67-1tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-85905-76-08th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-85906-57-07th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-85908-67-0seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-85965-07-06th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-85995-67-0sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Brazil
ISBNas­su­med er­rorCatalogs for checking
85-85905-67-0second digit was chan­ged. amazon.co.uk amazon.com amazon.de

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