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Open Library Covers API

This API provides a programmatic method to access the book covers and author photos available in the Open Library Covers Repository. Book covers can be accessed using Cover ID (internal cover ID), OLID (Open Library ID), ISBN, OCLC, LCCN and other identifiers like librarything and goodreads. Open Library has developed a suite of APIs to help developers get up and running with the provided reference data. They lend ebooks worldwide, and have over two million free ebooks available and 250,000 more in the lending library, where there is a web page for every book.