ISBN 8021025748 hat failed the check­sum digit test.
The following 12 formally correct ISBNs were determined. Starting from these ISBNs the value 8021025748 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: French language
ISBNas­su­med er­rorCatalogs for checking
2-02-102574-8first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-01-02574-8third digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-1574-8sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-2174-8seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-2574-3tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-2577-8ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-2594-8eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-210-4572-86th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-211-2574-8fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-250-2574-8fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Spain
ISBNas­su­med er­rorCatalogs for checking
84-210-2570-82nd and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Italy
ISBNas­su­med er­rorCatalogs for checking
88-210-2574-8second digit was chan­ged. amazon.co.uk amazon.com amazon.de

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