They have an API: http://isbndb.com/api/v1/docs/intro http://isbndb.com/api/v1/docs/intro According to that API intro page, their databases contain over 1.8 mi

They have an API: http://isbndb.com/api/v1/docs/intro http://isbndb.com/api/v1/docs/intro According to that API intro page, their databases contain over 1.8 million entries for books alone, so the download would be rather big I think.