TY  - BOOK
AU  - Ehrlich Paul R and others
TI  - Humam ecology :  Problems and solutions   
T2  - Series of books in biology  Ed by Donald Kennedy and Roderic B Park
U1  - Y:(G:5), L3 
PY  - 1973///
CY  - San Francisco  
PB  - Freeman         
KW  - Sociometry
N1  - Appendix P 281-88
ER  -