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H a r rar, J.George: '],he Race. bet\'leen procreatior-
and food production. Prepared fron 
a paper presented at the spring meeting of 
tl:e A:.:erican :Fhilosophical Society in Philadelphia, 
1965.-Ne'.'! YorkÖ '!'he Rockefeller 
Poundation 1965. 29 s. 8