TY  - BOOK
AU  - Trivedi, R. N. 
TI  - A textbook of environmental sciences
SN  - 8174885447
U1  - 372.357 TRI 
PY  - 1997///.
CY  - New delhi : 
PB  - Anmol publications, 
KW  - Enviornmental sciences.
ER  -