TY  - BOOK
AU  - Roy,Sovan
TI  - Environmental science : a comprehensive treatise on ecology and environment / 
U1  - 577.27 
PY  - 2003///
CY  - Kolkata : 
PB  - Publishing syndicate , 
KW  - ECOLOGY
N1  - Includes bibliographical references ,appendix and index
ER  -