{"key": "/works/OL2491183W", "title": "The Principles of Plane Trigonometry, Mensuration, Navigation and Surveying", "first_publish_date": "1831", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL348846A"}}], "type": {"key": "/type/work"}, "subjects": ["Measurement", "Plane trigonometry", "Navigation", "Surveying"], "covers": [9564437], "latest_revision": 3, "revision": 3, "created": {"type": "/type/datetime", "value": "2009-12-09T23:47:44.502073"}, "last_modified": {"type": "/type/datetime", "value": "2026-02-14T12:45:05.398966"}}