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Wallace A. Kennedy, Vernon van de Riet, James C. White, Jr., A Normative Sample of Intelligence and Achievement of Negro Elementary School Children in the Southeastern United States, Monographs of the Society for Research in Child Development, Vol. 28, No. 6, A Normative Sample of Intelligence and Achievement of Negro Elementary School Children in the Southeastern United States (1963), pp. 1-5+7-11+13-41+43-57+59-63+65-112
Kennedy et al. (Tue,) studied this question.
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