{"title": "Frontiers of Knowledge in Mental Retardation", "subtitle": "Fifth Congress of the International Association for the Scientific Study of Mental Deficiency", "authors": [{"key": "/authors/OL2790122A"}], "publish_date": "April 1981", "publishers": ["Pro ed"], "isbn_10": ["0839116373"], "isbn_13": ["9780839116370"], "physical_format": "Textbook Binding", "subjects": ["Congresses", "Mental retardation", "Mentally handicapped children", "Care", "Physiological aspects"], "type": {"key": "/type/edition"}, "source_records": ["amazon:0839116373"], "key": "/books/OL8224515M", "number_of_pages": 330, "works": [{"key": "/works/OL8376170W"}], "latest_revision": 3, "revision": 3, "created": {"type": "/type/datetime", "value": "2008-04-29T15:03:11.581851"}, "last_modified": {"type": "/type/datetime", "value": "2026-06-16T02:03:25.542676"}}