{"type": {"key": "/type/work"}, "title": "A materials book for the elementary science study", "subjects": ["Teaching", "Aids and devices", "Science", "Study and teaching (Elementary)", "Elementary Science Study (Educational Services Inc.)", "Elementary Science Study (Education Development Center)"], "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL4601851A"}}], "key": "/works/OL39312943W", "latest_revision": 2, "revision": 2, "created": {"type": "/type/datetime", "value": "2024-08-28T05:21:39.588966"}, "last_modified": {"type": "/type/datetime", "value": "2025-09-18T12:57:16.875126"}}