Evaluation of the Visual Perceptual Development Program with the mentally retarded at Polk State School and Hospital : a thesis in special education, 190 - 01 - 04 - LD1017 .C8133 1971 C3, Volume: Archives LD1017 .C8133 1971 C3; Volume: Carlson Library Level A Main Quarto Collection BF241 .C3. Clarion University Archives. http://buoy1.klnpa.org/repositories/2/resources/297 Accessed April 30, 2025.

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