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. ; 
<br/><br/><label>ISBN: </label>0131293176 (pbk.) 9780131293175 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.
<br/><br/><label>LC Class. No.: </label>G70.212  / .H49 2006