TY  - BOOK
AU  - Singh, Kalpana
AU  - Sharma, Umesh
AU  - Pathak, S.K
TI  - Realms of environment & ecology
SN  - 9788175157002
U1  - 628 
PY  - 2012///
CY  - New Delhi
PB  - Galgotia Publications
ER  -