{"created": {"type": "/type/datetime", "value": "2019-07-19T09:49:34.994597"}, "subject_places": ["United States"], "subjects": ["Sources", "National parks and reserves", "Law and legislation", "History", "National parks and reserves, united states"], "latest_revision": 2, "key": "/works/OL20020835W", "title": "America's national park system", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL1013027A"}}], "type": {"key": "/type/work"}, "last_modified": {"type": "/type/datetime", "value": "2020-08-05T00:58:45.972958"}, "revision": 2}