{"key": "/works/OL15744347W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL4628241A"}}], "title": "\u00c9tude sur les esclaves et les serfs d'\u00e9glise en France du VIe au XIIIe s\u00e8cle ...", "subject_places": ["France"], "subjects": ["Christian sociology", "Slavery", "Serfdom", "History"], "subject_times": ["Middle ages"], "type": {"key": "/type/work"}, "covers": [6768132], "latest_revision": 4, "revision": 4, "created": {"type": "/type/datetime", "value": "2011-06-06T20:07:24.332116"}, "last_modified": {"type": "/type/datetime", "value": "2025-08-24T01:00:15.554947"}}