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References
1.Forty-first annual report of the Pennsylvania Training School for Feeble-Minded Children . Elwyn, Pa. : 1895 .
2.Historical notes on institutions for the mentally defective: Elwyn Training School . American Journal of Mental Deficiency , 1941 , 45 , 341 -342 .
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A history of the care and study of the mentally retarded . Springfield, III. : Charles C Thomas , 1964 .