TY  - BOOK
AU  - Friedman,J
TI  - The evolution of social systems
SN  - 0 7156 0934 3
AV  - QH371.E96 1977 
PY  - 1977///
CY  - Gloucester
PB  - Duckworth
KW  - Evolution
KW  - Social evolution
KW  - Behaviour
KW  - Social biology
N1  - Includes index
ER  -