TY  - BOOK
AU  - Lenski,Gerhard
AU  - Lenski,Jean
TI  - Human societies : : an introduction to macrosociology / 
SN  - 0070371725
U1  - 301 LEN 
PY  - 1974///
CY  - New York: 
PB  - McGraw-Hill , 
KW  - Sociology
KW  - Social evolution
N1  -  Includes bibliographical references and index
ER  -