TY  - BOOK
AU  - Duggal, K.N
TI  - Elements of environmental engineering
SN  - 81-219-1547-3
U1  - 628 
PY  - 1998///
CY  - New Delhi
PB  - S. Chand
KW  - Environmental engineering
KW  - Water supply
KW  - Sewage treatment
KW  - Environmental sanitation
N1  - Includes index
ER  -