{"first_publish_date": "1888", "key": "/works/OL1535455W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL162817A"}}], "subjects": ["Boston Society of Natural History", "Science", "Study and teaching"], "title": "The educational principle", "lc_classifications": ["QH1 .B77 1881"], "type": {"key": "/type/work"}, "covers": [15227270], "latest_revision": 4, "revision": 4, "created": {"type": "/type/datetime", "value": "2009-12-09T21:48:26.453102"}, "last_modified": {"type": "/type/datetime", "value": "2026-06-04T04:37:38.490379"}}