TY  - GEN
AU  - Bernhardsen, Tor
AU  - Norway, Arendal
AU  - Viak, Asplan
TI  - Geographic information systems, an introduction
SN  - 8126511389
U1  - 910.285416 
PY  - 2002///
CY  - New Delhi
PB  - John Wiley
KW  - GEOGRAPHIC INFORMATION SYSTEMS
KW  - GEOGRAPHY
KW  - GIS
ER  -