{"first_publish_date": "1966", "last_modified": {"type": "/type/datetime", "value": "2020-11-05T12:56:15.709365"}, "title": "Geology and igneous petrology of the northern Elkhorn Mountains, Jefferson and Broadwater Counties, Montana", "created": {"type": "/type/datetime", "value": "2009-12-09T21:53:47.628955"}, "subject_places": ["Elkhorn Mountains", "Montana"], "lc_classifications": ["QE75 .P9 no. 510"], "latest_revision": 4, "key": "/works/OL1570194W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL168830A"}}], "type": {"key": "/type/work"}, "subjects": ["Geology", "Igneous Rocks", "Petrology", "Rocks, Igneous", "Igneous rocks"], "revision": 4}