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	1.	No cover image available More on genes, language, and human phylogeny by Zegura, Stephen Walker, William Stout, Karen Diamond, J Material type: Article; Format: print Language: Eng In: Current anthropology 31(4), 1990, p. 420-426 Availability: No items available.
	2.	No cover image available Control de drogas en las Américas : los límites de la flexibilidad by Walker, William Material type: Article; Format: print ; Literary form: Not fiction Language: Spa In: Cocaína : drogas, el Estado y la economía p. 91-140 Availability: No items available.

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