TY  - BOOK
AU  - Roger Perman Yue Ma , James Mc Gilvrey
AU  - Roger Perman Yue Ma , James Mc Gilvrey
TI  - Natural Research and Environmental Economics
SN  - 0-582-2572-71
PY  - 1996///
CY  - London
PB  - Longman
KW  - Economics
ER  -