Geographic information systems :  developments and applications / 
Les Worrall. 
 - 1st ed. 
 - New York :  Belhaven Press,  1990. 
 - 251 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>185293140X 
<br/><br/><label>LCCN: </label>90044434  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems.
<br/><br/><label>Dewey Class. No.: </label>910.285  / WOG