TY  - BOOK
AU  - Asthana,D.K.
AU  -  Asthana,Meera
TI  - Environment: Problems and solutions 
SN  - 8121916542
U1  - 628 21
PY  - 1999///, c1998
CY  - New Delhi
PB  - S. Chand
KW  - Environmental engineering
N1  - Includes bibliographical references and index
ER  -