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Open Library Subjects API - Followers

This API returns Open Library data details of a subject. When query parameter details=true is passed, related subjects, prominent publishers, prolific authors and publishing history are also included in the response. 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.