TY  - BOOK
AU  - Asthana,D.K.
AU  - Asthana,Meera
TI  - A textbook of environmental studies
SN  - 8121927641
U1  - 363.7 
PY  - 2006/// [reprinted 2007]
CY  - New Delhi
PB  - S. Chand & Company Ltd.
KW  - Environmental Science
N1  - Includes index
ER  -