{"subject_places": ["United States"], "subjects": ["Labor and laboring classes", "Unskilled labor", "Wage differentials", "Wages", "Working class", "Labor"], "key": "/works/OL6686068W", "title": "Wage differentials", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL1807434A"}}], "type": {"key": "/type/work"}, "latest_revision": 6, "revision": 6, "created": {"type": "/type/datetime", "value": "2009-12-10T19:34:17.905064"}, "last_modified": {"type": "/type/datetime", "value": "2025-09-30T18:16:09.588179"}}