TY  - BOOK
AU  - Asthana, D.K.
AU  - Asthana, Meera
TI  - A textbook of environmental studies
SN  -  978-81-219-2764-2
U1  - 375.0083 
PY  - 2012///, r2016
CY  - Kolkata
PB  - S. Chand
KW  - ENVIRONMENTAL SCIENCE
KW  - ENVIRONMENTAL EDUCATION
ER  -