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Pamela Kato Klebanov, Jeanne Brooks-Gunn, Cecelia McCarton, Marie C. McCormick, The Contribution of Neighborhood and Family Income to Developmental Test Scores over the First Three Years of Life, Child Development, Vol. 69, No. 5 (Oct., 1998), pp. 1420-1436
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Klebanov et al. (1998) studied this question.
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