TY  - BOOK
AU  - Chhatwal, G R  .
AU  - Mehra,M C  .
TI  - Environmental analysis : air, water, soil / 
SN  - 81-7041-229-3
U1  - 628 
PY  - 1997///
CY  - New Delhi : 
PB  - Anmol Publications Pvt Ltd , 
ER  -