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	1.	Memory performance of young, middle, and old adults. [electronic resource] by Davis, D D Friedrich, D D Producer: 19830920 In: International journal of aging & human development vol. 16 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Exploratory behavior in Down's syndrome and normal infants. [electronic resource] by Bradley-Johnson, S Friedrich, D D Wyrembelski, A R Producer: 19820109 In: Applied research in mental retardation vol. 2 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	Frequency judgments of nonretarded and retarded individuals. [electronic resource] by Libkuman, T M Friedrich, D D Holland, M K Beno, F P Producer: 19770415 In: Psychological reports vol. 40 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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