TY  - BOOK
AU  - Asthana,D.K.
AU  - Asthana,Meera
TI  - A textbook of environmental studies: for undergraduate students : as per UGC syllabus 
SN  - 8121927641
PY  - 2006///
CY  - New Delhi
PB  - S. Chand & Company
KW  - Environmental sciences
KW  - Pollution
ER  -