{"created": {"type": "/type/datetime", "value": "2009-12-08T05:07:53.839526"}, "subject_places": ["United States"], "subjects": ["Astronautics", "Exploration", "Planets", "Space flight to Mars", "Space probes"], "latest_revision": 2, "key": "/works/OL554088W", "title": "Planetary exploration", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL40701A"}}], "type": {"key": "/type/work"}, "last_modified": {"type": "/type/datetime", "value": "2010-12-05T18:07:28.558080"}, "revision": 2}