Davis ,E. Bruce <br/><br/>
Geographical information systems :  A visual approach / 

 - 1st ed. 
 - Toronto:  Onword press,  1996. 
 - xii, 374 p.: 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>1566900980 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information
<br/><br/><label>LC Class. No.: </label>G70.212  .D38  1996