TY  - GEN
AU  - Choudhary, A.K.
AU  - Prakash, Om
TI  - Environmental engineering
U1  - 628:504 
PY  - 1996///
CY  - New Delhi
PB  - Dhanpat Rai
KW  - 628:504
KW  - Safety engineering
KW  - Environmental engineering
ER  -