Cromley,Robert G. <br/><br/>
Digital cartography / 
Cromley,Robert G. 
 - New Jersey:  Prentice Hall,  1992. 
 - xi,317p;26p 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>013710930X 
<br/><br/><label>Dewey Class. No.: </label>526 CRO