TY  - BOOK
AU  - Simmons, I G
AU  - 
TI  - ecology of natural resources
U1  - 577.4 
PY  - 1981///
CY  - London
PB  - English Language Book Society
KW  - Ecology
KW  - Environment
KW  - Biology
KW  - Natural resources
N1  -  Ref. at the end of each chap
ER  -