Heywood, Ian. <br/><br/>
An Introducation to Georaphical information Systems/ 
Ian Heywood  
 - Delhi :  Pearson ,  1988 
<br/><br/><label>ISBN: </label>8178089823 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geogrephical.
<br/><br/><label>Dewey Class. No.: </label>910.285  / HEY