Books-Open Library Number of APIs: 3 Book GET https://openlibrary.org/api/books?bibkeys=ISBN:0201558025,LCCN:93005405&format=json Covers GET http://covers.openlibrary.org/b/isbn/0385472579-S.jpg Search GET http://openlibrary.org/search.json?q=the+lord+of+the+rings