by Kingsley Davis | .
by Morris Ginsberg | .
by Hans Raj | .
by Margaret S. Chaney | Margaret L. Ross.
by Jain,Sagar Chand | .
by Kerlinger,Fred N | .
by Y .C Halan | .
by E Warren Shows | Robert H Burton.
by Bartz, Albert E | .
by Hill, John W | .
by Dobyhanshky , Theodosius | .
by L.H. Haney | .
by Olin Sewall Pettingill | .
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