Introductory geographic information systems / 
John R. Jensen and Ryan R. Jensen. 
 - United States of America :  Pearson Educational, Inc,  c2013. 
 - 400 pages :  illustrations. ;  28 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9780133029536 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.