TY  - BOOK
AU  - Chhatwal, G. R., ed.
AU  - Mehra, M. C., ed.
AU  - Katyal, T., ed.
TI  - Environmental air pollution and its control
SN  - 8170412137
U1  - 363.7392 
PY  - 1989///
CY  - New Delhi
PB  - Anmol
ER  -