ISBN 9985441529 hat failed the check­sum digit test.
The following 11 formally correct ISBNs were determined. Starting from these ISBNs the value 9985441529 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
3-98544-152-9first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: International NGO Publishers and EU Organizations
ISBNas­su­med er­rorCatalogs for checking
92-854-4159-92nd and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Mexico
ISBNas­su­med er­rorCatalogs for checking
968-5441-52-9second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Kazakhstan
ISBNas­su­med er­rorCatalogs for checking
9965-441-52-9third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Estonia
ISBNas­su­med er­rorCatalogs for checking
9985-4-3152-9sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
9985-4-4152-4tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
9985-4-4155-9ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
9985-4-4172-9eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
9985-4-4852-9seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
9985-54-152-9fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: North Macedonia
ISBNas­su­med er­rorCatalogs for checking
9989-44-152-9fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de

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