Bernhardsen Tor Geographic information systems An introduction - 2 - New York John Wiley 1999 - xv, 372p cm. Bibliography: P 362-64 ISBN: 0471321923 2934.85 Source: 1056, 27/04/2000, Efficient General Book Subjects--Topical Terms: Geography irt Computer Science Dewey Class. No.: U:(D6,9(B), N9