ISBN 851510029 was input with 9 digits (one digit too few).
The ISBN 851510029 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 9 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: amazon.co.uk (UK), amazon.com (USA) and amazon.de (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: French language
ISBNas­su­med er­rorCatalogs for checking
2-85151-002-9first digit was drop­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Brazil
ISBNas­su­med er­rorCatalogs for checking
85-14-51002-9fourth digit was drop­ped. amazon.co.uk amazon.com amazon.de
85-15-10002-9sixth digit was drop­ped.
or
seven­th digit was drop­ped.		 amazon.co.uk amazon.com amazon.de
85-15-10002-9eighth digit was drop­ped. amazon.co.uk amazon.com amazon.de
85-15-10029-0tenth digit was drop­ped. amazon.co.uk amazon.com amazon.de
85-15-21002-9fifth digit was drop­ped. amazon.co.uk amazon.com amazon.de
85-515-1002-9second digit was drop­ped.
or
third digit was drop­ped.		 amazon.co.uk amazon.com amazon.de

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