TY  - BOOK
AU  - Singh, H.S.
TI  - Principles of Environmental Conservation
SN  - 8770891019
U1  - 333.72 
PY  - 1989///
CY  - Dehradun
PB  - International Book Distributors
KW  - Economics
KW  - Social sciences
KW  - Environmental protection
ER  -