TY  - BOOK
AU  - Duggal,K.N..
TI  - Elements of environmental engineering
SN  - 8121915473
AV  - TA170  .D84 2002
PY  - 2002///
CY  - Ram Nagar, New Delhi
PB  - S. Chand
KW  - Environmental engineering
KW  - Sanitary engineering
ER  -