{"isbn_13": ["9780123662262"], "last_modified": {"type": "/type/datetime", "value": "2008-04-29 13:35:46.87638"}, "languages": [{"key": "/l/eng"}], "publishers": ["Academic Press"], "number_of_pages": 320, "first_sentence": {"type": "/type/text", "value": "Although concepts of mental retardation are quite ancient, modern scientific psychology, including its concern with mental retardation, developed only in the late 19th century."}, "isbn_10": ["0123662265"], "publish_date": "April 2003", "key": "/b/OL7327253M", "authors": [{"key": "/a/OL1001559A"}], "title": "International Review of Research in Mental Retardation, Volume 26 (International Review of Research in Mental Retardation) (International Review of Research in Mental Retardation)", "type": {"key": "/type/edition"}, "id": 9986880, "revision": 1}