Bernhardsen, Tor. <br/><br/>
Geographic information systems :  an introduction / 
Tor Bernhardsen. 
 - 2nd ed. 
 - New York :  John Wiley & Sons,  1999. 
 - xvi, 372 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references (p. 362 - 364) and index. 
<br/><br/>
<br/><br/><label>ISBN: </label>0471321923 (cloth)  RM281.19 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.