TY  - BOOK
AU  - Ehrenfeld,David W.
TI  - Biological conservation
SN  - 030800498
AV  - QH 75 .E37 1970 
PY  - 1970///
CY  - NY
PB  - Holt
KW  - Nature conservation
KW  - Pollution
KW  - Wildlife conservation
ER  -