Heywood, Ian. <br/><br/>
An introduction to geographical information systems / 
Ian Heywood, Sarah Cornelius and Steve Carver. 
 - 2nd ed. 
 - New Delhi :  Pearson education ,  1998. 
 - 311 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/>
<br/><br/><label>ISBN: </label>8178089823 
<br/><br/><label>Subjects--Topical Terms: </label>--Environmental Science
<br/><br/><label>Dewey Class. No.: </label>910