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Patrick J. O'Sullivan, James E. Ysseldyke, Sandra L. Christenson, Martha L. Thurlow, Mildly Handicapped Elementary Students' Opportunity to Learn during Reading Instruction in Mainstream and Special Education Settings, Reading Research Quarterly, Vol. 25, No. 2 (Spring, 1990), pp. 131-146
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O’Sullivan et al. (1990) studied this question.
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