00626nam a2200121Ia 4500008004100000082001700041100003300058245025800091264001700349300000900366999001700375952011200392200527s9999||||xx |||||||||||||| ||und||  a371.92 CLA L  aClarke, A.D.B. , Lewis, M.M. 0aLearning Speech and Thought in the Mentally Retarded: Proceedings of Symposia 4 and 5 Held at the Middlesex Hospital Medical Sessions on 31st Oct1969 and 20th March 1970, Under the Auspices of the Institute for Research in the Mental Retardation, London  bLondonc1972  a83p.  c15242d15242  001040708ArchivesaAIISHbAIISHd2020-05-27l0o371.92 CLA Lp1576r2020-05-27 00:00:00w2020-05-27ySTS