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	1.	Perception of figure orientation by nonambulatory children with profound mental retardation. [electronic resource] by Krenn, M J Whiteley, J H Producer: 19900904 In: Perceptual and motor skills vol. 70 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Uses of the Bayley mental scale with nonambulatory profoundly mentally retarded children. [electronic resource] by Whiteley, J H Krenn, M J Producer: 19860305 In: American journal of mental deficiency vol. 90 Availability: No items available. Save to lists Add to cart (remove)

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