{"last_modified": {"type": "/type/datetime", "value": "2011-06-10T01:01:01.009647"}, "title": "Change of materials and construction of forts. Letter from the Secretary of War, in answer to a resolution of the House of April 15, in relation to changes which may have become necessary in materials and construction of forts, &c", "created": {"type": "/type/datetime", "value": "2009-12-11T04:00:27.469479"}, "subjects": ["Building materials", "Fortification", "Military bases"], "latest_revision": 3, "key": "/works/OL11084016W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL184870A"}}], "type": {"key": "/type/work"}, "revision": 3}