ISBN 9643518394 hat failed the check­sum digit test.
The following 17 formally correct ISBNs were determined. Starting from these ISBNs the value 9643518394 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: German language
ISBNas­su­med er­rorCatalogs for checking
3-643-51899-41st and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: China, People's Republic
ISBNas­su­med er­rorCatalogs for checking
7-6435-1839-4first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Sweden
ISBNas­su­med er­rorCatalogs for checking
91-43-56839-42nd and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Bulgaria
ISBNas­su­med er­rorCatalogs for checking
954-351-839-4second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Slovenia
ISBNas­su­med er­rorCatalogs for checking
961-354-839-43rd and 6th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Iran
ISBNas­su­med er­rorCatalogs for checking
964-351-339-4seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-351-809-4eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-351-839-6tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-351-849-38th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-351-938-47th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-358-839-4sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-359-831-46th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-391-839-4fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-531-839-44th and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-8518-39-4fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Israel
ISBNas­su­med er­rorCatalogs for checking
965-341-839-43rd and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Malaysia
ISBNas­su­med er­rorCatalogs for checking
967-351-839-4third digit was chan­ged. amazon.co.uk amazon.com amazon.de

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