TY  - GEN
AU  - Duggal, K. N.
TI  - Elements of environmental engineering
SN  - 81-219-1547-3
U1  - 628 
CY  - New Delhi
PB  - S. Chand, India
KW  - Environmental engineering
KW  - Water treatment
KW  - Water conservation
KW  - Water quality
KW  - Sanitation
N1  - 20010203; M
ER  -