TY  - BOOK
AU  - Radha, S,Ed.
AU  - Sankhyan, Amar Singh
TI  - Environmental challenges of the 21st century 
SN  - 8176293598
U1  - 363.707 
PY  - 2002///
CY  - New Delhi
PB  - Deep & Deep 
KW  - Environmental problems and services
ER  -