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	1.	An operant-conditioning program for severely and profoundly retarded adults. [electronic resource] by Wilson, T F Copas, D E Ross, H F Producer: 19720316 In: Hospital & community psychiatry vol. 23 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Carbromal intoxication. [electronic resource] by COPAS, D E KAY, W W LONGMAN, V H Producer: 20000701 In: Lancet (London, England) vol. 1 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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