ISBN 8090050915 hat failed the check­sum digit test.
The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 8090050915 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
0-09-805091-51st and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-600-5091-5third digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900501-1-5eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900509-0-5ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900509-1-3tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900559-1-5seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-900590-1-57th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-900909-1-5sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-907509-1-5fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-960509-1-5fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: India
ISBNas­su­med er­rorCatalogs for checking
81-900509-1-5second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Brazil
ISBNas­su­med er­rorCatalogs for checking
85-900009-1-52nd and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Korea, Republic
ISBNas­su­med er­rorCatalogs for checking
89-00-05091-52nd and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de

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