TY - BOOK CN - HV3006.A1 CY - Washington : DA - 1977. ID - 9256 KW - People with mental disabilities KW - People with mental disabilities N1 - At head of title: MR 76. N1 - Includes index. PB - for sale by the Supt. of Docs., U.S. Govt. Print Off., PP - Washington : PY - 1977. T1 - Mental retardation, past and present / TI - Mental retardation, past and present / ER -