TY  - BOOK
AU  - Asthana, D.K. 
AU  - Asthana, Meera 
TI  - Environment : problems and solutions
SN  - 9788121916547
U1  - 363.7 As83e 
PY  - 1998///
CY  - New Delhi
PB  - S Chand and Company Limited
KW  - Nature
KW  - Effect of human beings on
KW  - Environmental sciences
ER  -