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2. A History of Mental Retardation;Scheerenberger,1983
3. Caring for the Retarded in America: a History;Tyor,1984
4. Starcross: Out of the Mainstream;Radford,1988
5. Radford J. P. and Park D. C. A convenient means of riddance: control of the feebleminded in Ontario, 1876–1930. Department of Geography, York University, Toronto.