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	1.	What sleep research can learn from history. [electronic resource] by Ekirch, A Roger Producer: 20190320 In: Sleep health vol. 4 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Segmented Sleep in Preindustrial Societies. [electronic resource] by Ekirch, A Roger Producer: 20160725 In: Sleep vol. 39 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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