TY  - BOOK
AU  - Chawla, S.
TI  - A Textbook of Environmental Studies
SN  - 9781259006388
U1  - 620.8 
PY  - 2017///
CY  - Chennai
PB  - Mc Graw Hill Education (India) Pvt. Ltd.
KW  - CIVI
ER  -