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	1.	No cover image available Food-producing systems available to the ancient Maya by Wilken, Gene Material type: Article; Format: print Language: Eng In: American antiquity: journal of the society for american archaeology 36(4), 1971, p. 432-448: : ill., rés.(Angl) Availability: No items available.
	2.	Transfering traditional technology : a bottom.up approach for fragile lands by Wilken, Gene Symposium on fragile lands of Latin America: The search for sustainable uses ( 17-19 mars 1988 : New Orleans) Series: Westview special studies in social, political, and economic development Material type: Article; Format: print ; Literary form: Not fiction Language: Eng In: Fragile lands of Latin America : Strategies for sustainable development p. 44-57 Availability: No items available.

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