{"first_publish_date": "1999", "description": {"type": "/type/text", "value": "Discusses how people have used caves, mines, and tunnels to explore, utilize, travel through, and inhabit the interior of the earth."}, "last_modified": {"type": "/type/datetime", "value": "2020-11-28T19:20:21.902652"}, "title": "The world of caves, mines and tunnels", "created": {"type": "/type/datetime", "value": "2009-12-09T22:40:07.206612"}, "covers": [1619961], "lc_classifications": ["TA807 .H63 1999"], "latest_revision": 4, "key": "/works/OL1985433W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL238882A"}}], "type": {"key": "/type/work"}, "subjects": ["Juvenile literature", "Mines and mineral resources", "Caves", "Tunnels", "Underground construction", "History"], "revision": 4}