ISBN 8120620061 hat failed the check­sum digit test.
The following 14 formally correct ISBNs were determined. Starting from these ISBNs the value 8120620061 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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Tiu ĉi paĝo en Esperanto (Unikodo)
Tiu cxi pagxo en Esperanto (x-igata)
ISBN prefix group: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-120-62006-1first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: India
ISBNas­su­med er­rorCatalogs for checking
81-00-62026-13rd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
81-206-0006-1sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
81-206-2001-1ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
81-206-2006-2tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
81-206-2046-1eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
81-206-2306-1seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
81-206-2600-17th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
81-206-6002-16th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
81-208-2006-1fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
81-286-2006-1fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
81-906200-6-1third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Norway
ISBNas­su­med er­rorCatalogs for checking
82-10-62006-12nd and 3rd digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Yugoslavia
ISBNas­su­med er­rorCatalogs for checking
86-20-62006-1second digit was chan­ged. amazon.co.uk amazon.com amazon.de

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