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Freya Weaver Owen, Pauline Austin Adams, Thomas Forrest, Lois Meek Stolz, Sara Fisher, Learning Disorders in Children: Sibling Studies, Monographs of the Society for Research in Child Development, Vol. 36, No. 4, Learning Disorders in Children: Sibling Studies (Nov., 1971), pp. 1-77
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Owen et al. (1971) studied this question.
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