Heywood, D. Ian <br/><br/>
An introduction to geographical information systems / 
 Geographical information systems 
Ian Heywood, Sarah Cornelius, Steve Carver 
 - 4th ed. 
 - Harlow, England :  Prentice Hall,  2011 
 - xxxiv, 446 p. :  col. ill. ;  27 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780273722595 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems