{"first_publish_date": "1962", "last_modified": {"type": "/type/datetime", "value": "2020-11-05T05:21:41.442358"}, "title": "Trace elements, rare earths, and chemical composition of southern Illinois igneous rocks", "created": {"type": "/type/datetime", "value": "2009-12-09T21:11:48.283349"}, "covers": [7233156], "subject_places": ["Illinois"], "lc_classifications": ["QE105 .A45 no. 330"], "latest_revision": 5, "key": "/works/OL1356502W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL138744A"}}], "type": {"key": "/type/work"}, "subjects": ["Igneous Rocks", "Petrology", "Rare earths", "Rocks, Igneous", "Trace elements", "Igneous rocks"], "revision": 5}