Chrisman, Nicholas. <br/><br/>
Exploring geographic information systems. 

 - 2nd. 
 - New York :  John Wiley,  2002. 
 - xiv, 305p. :ill. 
<br/><br/> Includes index and Bibliography. 
<br/><br/><label>ISBN: </label>0471427314 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.