TY  - BOOK
AU  - Agrawal, K.M & Sikdar, P.K 
TI  - Text Book of Enviroment 
SN  - 9780333937471
U1  - 363.7 
PY  - 2005///
CY  - New Delhi, Macmillan 
PB  - New Delhi, Macmillan 
KW  - Enviornmental Science
ER  -