Walker, Terri C. <br/><br/>
Geographic information systems :  an assessment of technology, applications and products / 
by Terri C. Walker and Richard K. Miller 
 - 2nd ed. 
 - Madison, GA. :  SEAI Technical Publications,  1990 
 - 3 v. :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label>0896711102  RM1212.50 (vol.1-3) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems