{"covers": [10035890], "last_modified": {"type": "/type/datetime", "value": "2020-09-11T05:02:32.290641"}, "latest_revision": 5, "key": "/works/OL1111682W", "authors": [{"type": "/type/author_role", "author": {"key": "/authors/OL114284A"}}], "created": {"type": "/type/datetime", "value": "2009-12-09T20:31:18.866684"}, "title": "Operation of trains on heavy grades", "subject_places": ["United States"], "subjects": ["Safety appliances", "Railroads", "Air-brakes", "Brakes"], "type": {"key": "/type/work"}, "revision": 5}