{"subject_places": ["United States"], "subjects": ["Dust control", "Coal mines and mining", "Dust diseases", "Lungs", "Standards"], "key": "/works/OL23617311W", "title": "Occupational exposure to respirable coal mine dust", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL678715A"}}], "type": {"key": "/type/work"}, "latest_revision": 2, "revision": 2, "created": {"type": "/type/datetime", "value": "2020-11-24T13:41:21.289785"}, "last_modified": {"type": "/type/datetime", "value": "2025-07-31T17:03:06.629003"}}