ISBN 9634972990 hat failed the check­sum digit test.

The following 11 formally correct ISBNs were determined. Starting from these ISBNs the value 9634972990 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, and whether any book is listed for the respective URL. To the home page
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Tiu ĉi paĝo en Esperanto (Unikodo)
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ISBN prefix group: [no known group prefix]
ISBNas­su­med er­rorCatalogs for checking
6634972990first digit was chan­ged.
ISBN prefix group: Hong Kong, China
ISBNas­su­med er­rorCatalogs for checking
962-497-299-0third digit was chan­ged.
ISBN prefix group: Hungary
ISBNas­su­med er­rorCatalogs for checking
963-447-299-0fifth digit was chan­ged.
963-491-299-0sixth digit was chan­ged.
963-497-099-0seven­th digit was chan­ged.
963-497-295-0ninth digit was chan­ged.
963-497-299-3tenth digit was chan­ged.
963-497-992-07th and 9th digits were swap­ped.
963-697-299-0fourth digit was chan­ged.
963-9972-94-04th and 9th digits were swap­ped.
ISBN prefix group: Pakistan
ISBNas­su­med er­rorCatalogs for checking
969-497-293-03rd and 9th digits were swap­ped.

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