TY  - GEN
AU  - Balasurbramanyan
AU  - Gurdeep r, Chatwal
TI  - Environmental studeis
SN  - 81-8318-594-0
U1  - 363.7 BAL 
CY  - Bombay, Himalaya Publishing House
KW  - Eco-system, Natural resources, Energy sources, Environmental Pollution, Noise Pollution, Global Warming, Automobile Pollution, Acid rain, Ozone layer
ER  -