ISBN 9788086940 hat failed the check­sum digit test.
The following 13 formally correct ISBNs were determined. Starting from these ISBNs the value 9788086940 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
7-7880-8694-0first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Mexico
ISBNas­su­med er­rorCatalogs for checking
968-808-694-0second digit was chan­ged. amazon.co.uk amazon.com amazon.de
970-808-694-0third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Nigeria
ISBNas­su­med er­rorCatalogs for checking
978-2086-94-0fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-40869-8-04th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
978-8046-94-0sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-8081-94-0seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-8086-64-0eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-8086-94-2tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-8086-95-0ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
978-8096-84-06th and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
978-8486-94-0fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Hong Kong, China
ISBNas­su­med er­rorCatalogs for checking
988-708-694-02nd and 4th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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