TY  - BOOK
AU  - Tiwari,Manoj
AU  - Khulbe,Kapil  .
AU  - Tiwari,Archana
TI  - Environmental studies / 
U1  - 363.7 
PY  - 2007///
CY  - NewDelhi : 
PB  - I K International , 
KW  - ENVIRONMENTAL SCIENCE
N1  - Includes index
ER  -