Heywood, D. Ian. <br/><br/>
An introduction to geographical information systems /  
Ian Heywood, Sarah Cornelius, Steve Carver. 
 - 3rd ed. 
 - Harlow, England ;    New York :    Pearson Prentice Hall,    2006. 
 - xxxiii, 426 p. :    col. ill. ;    27 cm. 
<br/><br/>Includes bibliographical references (p. [400]-411) and index. 
<br/><br/><label>ISBN: </label>0131293176 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.
<br/><br/><label>LC Class. No.: </label>G70.212   /  .H49 2006