TY  - BOOK
AU  - Basak N.N
TI  - Enviromental engineering 
SN  - 0070494630
AV  - TA170 .B37
PY  - 2006///
CY  - New Delhi 
PB  - Tata McGraw Hill Publishing Comap[any Limited 
KW  - Enviromental Engineering
ER  -