Book Reviews: The Evolution of Social Systems. Edited by J. FRIEDMAN and M. J. ROWLANDS. (London: Gerald Duckworth & Co.,and Pittsburgh: The University of Pittsburgh Press,1979. Pp. xv,652. Tables,figures,maps,index. $45.00.)

Book Reviews: The Evolution of Social Systems. Edited by J. FRIEDMAN and M. J. ROWLANDS. (London: Gerald Duckworth & Co.,and Pittsburgh: The University of Pittsburgh Press,1979. Pp. xv,652. Tables,figures,maps,index. $45.00.)