TY  - BOOK
AU  - NAG,P.
AU  - SENGUPTA,SMITA
TI  - Introduction to geographical information system
SN  - 8180694402
U1  - GEO 910.285425 
PY  - 2008///
CY  - New Delhi
PB  - Concept
KW  - GEOGRAPHICAL INFORMATION SYSTEMS(GIS)
ER  -