{"type": {"key": "/type/work"}, "title": "Some economic aspects of bolter mill operations in southeastern Michigan", "subjects": ["Sawmills", "Logging"], "subject_places": ["Michigan"], "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL1398823A"}}, {"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL2260821A"}}], "key": "/works/OL45554686W", "latest_revision": 2, "revision": 2, "created": {"type": "/type/datetime", "value": "2026-05-24T10:50:39.679712"}, "last_modified": {"type": "/type/datetime", "value": "2026-06-01T23:40:11.573477"}}