Cromley, Robert G. <br/><br/>
Digital cartography 
Robert G. Cromley 
 - Englewood Cliffs, N.J.  Prentice-Hall  1992 
 - 317 p. : ill. ; 23 cm. 
<br/><br/><label>ISBN: </label>013710930X 
<br/><br/><label>LCCN: </label>91-16455 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital mapping