TY  - GEN
AU  - Guha Bakshi. D.N
AU  -  Sen, Subir
AU  -  Banerjee,Samar Kumar
TI  - Text Book of environmental science
U1  - 301.3 
PY  - 2000///
CY  - Calcutta
PB  - Calcutta BK House
KW  - Environmental Science
N1  - 2nd ed. 2001, reprint 2010
ER  -