{"created": {"type": "/type/datetime", "value": "2009-12-10T18:46:09.027655"}, "subjects": ["Teaching, aids and devices"], "latest_revision": 3, "key": "/works/OL6212446W", "title": "A Teacher's Guide to Using Primary Sources (Pages from History)", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL1603474A"}}], "type": {"key": "/type/work"}, "last_modified": {"type": "/type/datetime", "value": "2020-08-01T01:45:48.421617"}, "covers": [5036859], "revision": 3}