TY - JOUR A1 - Steward, J. H. T1 - Evolutionary Principles and Social Types JF - S. Tax, S., The Evolution of Man. Man, Culture, and Society. Vol. II of Evolution after Darwin, Chicago and London (The University of Chicago Press) 1960, pp. 169-186. Y1 - 1960 ER - TY - JOUR A1 - Steward, J. H. T1 - Causal Factors and Processes in the Evolution of Pre-farming Societies JF - R. B. Lee and I. DeVore (Eds.), Man the Hunter, Chicago (Aldine Publishing Company) 1968, pp. 321-334. Y1 - 1968 N1 - Marks in the copy ER -