TY  - BOOK
AU  - Lenski, Gerhard
AU  - Lenski, Jean
TI  - Human societies: an introduction to macrosociology
SN  - 0070371814
AV  - HM 51 Len 
PY  - 1987///
CY  - New York
PB  - McGraw-Hill
KW  - SOCIAL EVOLUTION
KW  - SOCIAL SYSTEMS -- HISTORY
N1  - Bibliography
ER  -