Google books API searching by ISBN

Are you using the deprecated data API? With Books API v1 (from Labs) you could use the query https://www.googleapis.com/books/v1/volumes?q=isbn:<your_isbn_here> for example https://www.googleapis.com/books/v1/volumes?q=isbn:0735619670 to query a book by its ISBN. You may want to look at Googles example code: BooksSample.java

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