TY  - BOOK
AU  - Choubey, Shweta.
TI  - Textbook of environment and ecology
SN  - 9788177000252 
U1  - 628.5 
PY  - 1994///
CY  - New Delhi
PB  - Dhanpat Rai And Sons
KW  - Sanitary municipal engineering
ER  -