TY  - BOOK
AU  - Bernhardsen, Tor
AU  - 
TI  - Geographic information systems: an introduction
SN  - 0-471-32192-3
U1  - 911:681.516 
PY  - 1999///
CY  - New York
PB  - John Wiley
KW  - Geographical information systems
KW  - Geographic Information System
KW  - Geographic data analysis
KW  - GIS
KW  - georgraphical ionformation systems
ER  -