You're right. We should work on validating ISBN, both at the point of data 
entry, batch imports and search. There's a pretty old bug about it, for what 
it's worth:

https://bugs.launchpad.net/openlibrary/+bug/485999

On 2/2/11 9:40 AM, Karen Coyle wrote:
> It occurs to me that ISBNs may be getting normalized in batch input
> but not when they are keyed by a user. I must admit that I have no
> idea if any quality control is done on user input data -- can anyone
> speak to that? There are probably very few fields where QC can be
> applied, in fact, but in the case of ISBN it might be worth doing.
>
> kc
>
> Quoting Edward Betts<[email protected]>:
>
>> This works:
>>
>> http://openlibrary.org/api/books?bibkeys=ISBN:978-1-4493-0322-8&jscmd=data&format=json
>>
>> We need to improve our handling of ISBNs.
>>
>> On 2011-02-01 16:13, Peter Murray wrote:
>>> I'm having problems linking to ISBNs that have been added to Open
>>> Library in the past few days. These are cases where I've created a new
>>> work or a new edition of an existing work. In only one case -- the third
>>> one below -- where the ISBN already existed in Open Library -- is the
>>> Open Book plugin for WordPress ISBN working. In the other two cases, I'm
>>> getting "[No Book Data for this Book Number]". If I search for ISBN in
>>> the advanced search interface of the Open Library website, it will find
>>> the work and edition.
>>>
>>> /[openbook booknumber="9780596809799"
>>> publisherurl="http://oreilly.com/catalog/9780596809799";]<br clear="all" />/
>>>
>>> /[No Book Data for this Book Number]/
>>>
>>> [openbook booknumber="9781449303228"
>>> publisherurl="http://oreilly.com/catalog/9781449303228";]<br clear="all" />
>>>
>>> /[No Book Data for this Book Number]/
>>> /
>>> /
>>>
>>> [openbook booknumber="9780596557270"
>>> publisherurl="http://oreilly.com/catalog/9780596557270";]<br clear="all" />
>>>
>>> Head First Physics
>>> <http://openlibrary.org/books/OL24598378M/Head_First_Physics>
>>> Heather Lang<http://openlibrary.org/authors/OL3497359A/Heather_Lang>;
>>> O'Reilly<http://oreilly.com/catalog/9780596557270>  2009
>>> WorldCat<http://worldcat.org/isbn/9780596557270>•LibraryThing
>>> <http://librarything.com/isbn/9780596557270>•Google Books
>>> <http://books.google.com/books?as_isbn=9780596557270>•BookFinder
>>> <http://www.bookfinder.com/search/?st=xl&ac=qr&isbn=9780596557270>
>>> /
>>> /
>>> /
>>> /
>>>
>>> For the one that does work, the API call made by the Open Book plug-in
>>> seems to be:
>>>
>>> http://openlibrary.org/api/books?bibkeys=ISBN:9780596557270&jscmd=data&format=json
>>> <http://openlibrary.org/api/books?bibkeys=ISBN:9780596557270&jscmd=data&format=json>
>>>
>>> It returns an Open Library JSON object. For the one that doesn't work,
>>> the API call made by the Open Book plug-in seems to be:
>>>
>>> http://openlibrary.org/api/books?bibkeys=ISBN:9781449303228&jscmd=data&format=json
>>> <http://openlibrary.org/api/books?bibkeys=ISBN:9781449303228&jscmd=data&format=json>
>>>
>>> It returns an empty JSON object.
>>>
>>> Am I missing something obvious?
>>>
>>>
>>> Peter
>>> --
>>> Peter Murray [email protected]<mailto:[email protected]>
>>> tel:+1-678-235-2955
>>> Ass't Director, Technology Services Development http://dltj.org/about/
>>> Lyrasis -- Great Libraries. Strong Communities. Innovative Answers.
>>> The Disruptive Library Technology Jester http://dltj.org/
>>> Attrib-Noncomm-Share http://creativecommons.org/licenses/by-nc-sa/2.5/
>>>
>>>
>>>
>>>
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