{"lc_classifications": ["HC103 .F85 1974"], "key": "/works/OL2533673W", "title": "A treatise on the principal trades and manufactures of the United States", "subject_places": ["United States"], "first_publish_date": "1974", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL358232A"}}], "dewey_number": ["338/.0973"], "type": {"key": "/type/work"}, "subjects": ["Industries"], "covers": [13025146], "latest_revision": 3, "revision": 3, "created": {"type": "/type/datetime", "value": "2009-12-09T23:53:21.433397"}, "last_modified": {"type": "/type/datetime", "value": "2022-12-04T04:18:08.167766"}}