{"created": {"type": "/type/datetime", "value": "2009-12-10T18:42:40.854113"}, "subjects": ["Dialectical materialism", "History", "Philosophy"], "latest_revision": 3, "key": "/works/OL6181515W", "title": "Historical materialism", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL1589712A"}}], "type": {"key": "/type/work"}, "last_modified": {"type": "/type/datetime", "value": "2020-09-30T03:54:48.812105"}, "covers": [10042720], "revision": 3}