TY  - BOOK
AU  - Negi S. S 
TI  - A hand book of environmental science
SN  - 9788121106757
U1  - 363.7 NEG 
PY  - 2008///
CY  - Dehra Dun : 
PB  - Bishen Singh Mahendra Pal Singh,	
N1  - Includes Index.
ER  -