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	1.	Action-concept learning in retarded children using photographic slides, motion pictures, sequences, and live demonstrations. [electronic resource] by Stephens, W E Ludy, I E Producer: 19760129 In: American journal of mental deficiency vol. 80 Availability: No items available. Save to lists Add to cart (remove)
	2.	Action-concept usage by nonretarded and retarded children on structured tasks with praise for performance. [electronic resource] by Stephens, W E Holder, L O Ludy, I E Producer: 19751011 In: American journal of mental deficiency vol. 79 Availability: No items available. Save to lists Add to cart (remove)

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