Bernhardsen, Tor <br/><br/>
Geographic information systems :  an introduction / 
Tor Bernhardsen 
 - 3rd ed. 
 - New York, NY :  Wiley,  2002 
 - xiii, 428 p. :  ill., maps ;  25 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780471419686 (cloth : alk. paper) 0471419680 (cloth : alk. paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems