Friedman, J. . The evolution of social systems / edited by J. Friedman and M.J. Rowlands. - Gloueester : Duckworth , 1982. - xiv,562p. : ills,figs,maps ; 25cm . Includes index ISBN: 0715609343 UKP 28.00 Subjects--Index Terms: SOCIAL EVOLUTION Dewey Class. No.: 303.4 / FRI/E