TY  - GEN
AU  - Sil, Ajit
TI  - Environment
U1  - 301.3 
PY  - 2002///
CY  - Kolkata
PB  - Himalayan  BKs
KW  - Environmental  Science
N1  - 3rd ed. 2007, reprint 2009,  169 p
ER  -