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Get editions of a work. Returns publishers, publication dates, page counts, and ISBNs

{entries: [{title, publishers, publish_date, isbn_13}]}

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}]}