ISBN 3930100385 hat failed the check­sum digit test.
The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 3930100385 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: German language
ISBNas­su­med er­rorCatalogs for checking
3-13-010038-5second digit was chan­ged. amazon.co.uk amazon.com amazon.de
3-390-10038-52nd and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de
3-930000-38-5fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
3-930100-18-5eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
3-930100-35-5ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
3-930100-38-Xtenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
3-930100-83-58th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
3-930104-38-5seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
3-930108-30-57th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
3-930110-38-5sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
3-937100-38-5fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
3-9501003-8-5third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Costa Rica
ISBNas­su­med er­rorCatalogs for checking
9930-10-038-5first digit was chan­ged. amazon.co.uk amazon.com amazon.de

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