{"title": "The principles and practice of obstetrics", "subjects": ["Obstetrics", "Medical Reference Books", "Pregnancy", "Obstetric Surgical Procedures"], "key": "/works/OL7572115W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL2319049A"}}], "type": {"key": "/type/work"}, "latest_revision": 4, "revision": 4, "created": {"type": "/type/datetime", "value": "2009-12-10T21:25:51.997852"}, "last_modified": {"type": "/type/datetime", "value": "2026-08-13T18:19:44.715811"}}