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	1.	No cover image available Maize productivity in the eastern Woodlands and great plains of North America by Schroeder, Sissel Material type: Article; Format: print Language: Eng In: American antiquity 64(3), 1999, p. 499-516: : graph., tab. Availability: No items available.
	2.	No cover image available Understanding variation in prehistoric agricultural productivity : the importance of distinguishing among potential, available, and consumptive yields by Schroeder, Sissel Material type: Article; Format: print Language: Eng In: American antiquity 66(3), 2001, p. 517-525: : tab. Availability: No items available.

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