TY  - BOOK
AU  - Purohit,S.K.
TI  - Chemical and biological methods of water and air pollution control : a practical hygiene manual
U1  - 628.5 
PY  - 1985///
CY  - Bikaner
PB  - Agro Botanical Publishers
KW  - Environment
KW  - Water and air pollution control
ER  -