TY  - BOOK
AU  - Singh, H.S.
AU  - Singh, H.S.
TI  - Principles of environmental conservation
SN  - 87-7089-101-9
U1  - 363.7 SIP 22
PY  - 1989///
CY  - India
PB  - International Book Dist.
KW  -  
KW  - Environmental problems
ER  -