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Get a book work by Open Library ID. Returns title, description, subjects, and covers

{title, description, subjects, covers, key}

Browse books in a subject (e.g. 'science_fiction', 'history', 'fantasy'). Returns work_count and works[] each with title, authors, cover_id, and first_publish_year

{work_count, works: [{title, authors, key, cover_id}]}