TY  - BOOK
AU  - Perman Roger, and others
TI  - Natural resource and environmental economics
SN  - 0 58236876 6
U1  - X:271:(G:55), N6;N9/TD3 
PY  - 1999///
CY  - London
PB  - Longman          
KW  -  Economics
KW  - Natural Resources
ER  -