Heywood, D. Ian. <br/><br/>
An introduction to geographical information systems / 
 Geographical information systems 
Ian Heywood, Sarah Cornelius, Steve Carver.  
 - 4th edition. 
 - Harlow, England ;   Toronto :   Prentice Hall,   2011. 
 - xxxiv, 446 pages :   color illustrations ;   27 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780273722595 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.