ISBN 0620428439 hat failed the check­sum digit test.
The following 14 formally correct ISBNs were determined. Starting from these ISBNs the value 0620428439 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
0-520-42843-9second digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-620-42343-9seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-620-42813-9eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-620-42843-0tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-620-42844-9ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-620-49843-9sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-620-82843-9fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-625-42843-9fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-628-42043-94th and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-650-42843-9third digit was chan­ged. amazon.co.uk amazon.com amazon.de
0-680-42243-93rd and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
0-920428-43-62nd and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: German language
ISBNas­su­med er­rorCatalogs for checking
3-620-42840-91st and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Hong Kong, China
ISBNas­su­med er­rorCatalogs for checking
962-04-2843-9first digit was chan­ged. amazon.co.uk amazon.com amazon.de

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