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The special class for backward children : an educational experiment conducted for the instruction of teachers and other students of child welfare, by the Psychological Laboratory and Clinic of the University of Pennsylvania / reported by Lightner Witmer; University of Pennsylvania. Psychological Laboratory and Clinic; Philadelphia : Psychological Clinic Press, 1911; Signed by author: To Mildred Loring Sylvester with the compliments and gratitude of Lightner Witmer"""";""Also issued online""

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