TY  - BOOK
AU  - Kayastha S.L.
AU  - Singh H.H.
AU  - Kumra V.K.
AU  - Nag P.(et.al)...
TI  - Geography and environment: Issues and challenges 
U1  - 910 KAY 
CY  - New Delhi
N1  - Include bibliographical references and index
ER  -