{"type": {"key": "/type/work"}, "title": "Index to operating expenses", "subjects": ["Railroads", "Accounting", "Cost of operation"], "subject_places": ["United States"], "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL13913689A"}}, {"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL7184793A"}}], "key": "/works/OL43543296W", "latest_revision": 1, "revision": 1, "created": {"type": "/type/datetime", "value": "2025-06-20T02:18:23.611662"}, "last_modified": {"type": "/type/datetime", "value": "2025-06-20T02:18:23.611662"}}