TY  - BOOK
AU  -  Tiwari, Shiv Kumar
TI  - Environmental Science 
SN  - 9788126914753
U1  - 333.7 
PY  - 2011///
CY  - New Delhi
PB  - Atlantic 
KW  - Geology,
KW  - Environmental education
KW  -  Human ecology
KW  - Environmental sciences
ER  -