ISBN 802420651 was input with 9 digits (one digit too few).

The ISBN 802420651 that you entered has got 9 digits, i.e. one digit is missing to make a valid ISBN. You can find information on the format of an ISBN on the home page of this site. This site has found the following 10 numerically correct ISBN out of which the ISBN that you input coule have resulted by a single error (dropping one digit). You can now check out these suggestions in the databases of the following booksellers' sites: (UK), (USA) and (Germany). Additional sites to search by ISBN (in this case, in catalogs of libraries) are e.g. the Library of Congress (USA) or the search gateway of the Deutsche Bibliothek. To the home page
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ISBN prefix group: [no known group prefix]
ISBNas­su­med er­rorCatalogs for checking
6802420651first digit was drop­ped.
ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-12-42065-1third digit was drop­ped.
80-242-0065-1sixth digit was drop­ped.
seven­th digit was drop­ped.
80-242-0650-1ninth digit was drop­ped.
80-242-0651-Xtenth digit was drop­ped.
80-242-0695-1eighth digit was drop­ped.
80-244-2065-1fourth digit was drop­ped.
fifth digit was drop­ped.
ISBN prefix group: Denmark
ISBNas­su­med er­rorCatalogs for checking
87-02-42065-1second digit was drop­ped.

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