Schroeder, Sissel. <br/><br/>
Understanding variation in prehistoric agricultural productivity :   the importance of distinguishing among potential available and consumptive yields. 

 - Washington-US :   Society for American Archaeology,   2001. 
 - p. 517-529 :   il. 
 - Trimestral 
 - Vol. 66, no, 3 (Jul 2001) 
 - American Antiquity ;   vol. 66 no. 3 .
 - Washington.   Society for American Archaeology. .
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