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2. Bayley, N. and Pinneau, S. R. (1952). Ibid., 41, 371.
3. and Cretinism;Benda, C.E.,1949
4. Bixby, E. M. and Benda, C. E. (1944). Amer. J. ment. Defic., 49, 138.
5. Mongolism: A Study of the Physical and Mental Characteristics of Mongolian Imbeciles;Brousseau, K.,1928