TY  - BOOK
AU  - Ehrlich Paul R
AU  -  Ehrlich Anne H
TI  - Population resources environment :  issues in human ecology
T2  - Series of books in biology, ed by Donald Kennedy and Roderick B Park
U1  - Y1:52.1, L0-;1 
PY  - 1970///
CY  - San
PB  - Francisco W H Freeman and Co  
KW  - SOCIOLOGY
ER  -