TY  - GEN
AU  - Radha, S.
AU  - Sankhyan, Amar Singh
TI  - Environmental challenges of the 21st century
SN  - (978)+8176293598
U1  - 344.046 
PY  - 2004///
CY  - New Delhi
PB  - Deep & deep publications
KW  - Environmental protection
KW  - Pollution--Environmental aspects
KW  - Sustainable development
N1  - Includes bibliographical references and index
ER  -