{"covers": [4582080], "key": "/works/OL775925W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL64330A"}}], "title": "Unreclaimed hardrock mines", "subject_places": ["United States"], "subjects": ["Strip mining", "Mines and mineral resources", "Mineral industries", "Mining law", "Environmental aspects of Strip mining", "Environmental aspects of Mines and mineral resources", "Environmental aspects of Mineral industries", "Environmental aspects"], "type": {"key": "/type/work"}, "latest_revision": 6, "revision": 6, "created": {"type": "/type/datetime", "value": "2009-12-09T03:46:26.374702"}, "last_modified": {"type": "/type/datetime", "value": "2025-12-20T00:57:55.179165"}}