TY  - BOOK
AU  - Bernhardsen,Tor
TI  - Geographic information systems: an introduction 
SN  - 9780471419686 (cloth : alk. paper)
PY  - 2002///
CY  - New York, NY
PB  - Wiley
KW  - Geographic information systems
N1  - Includes bibliographical references and index
ER  -