Geographical information systems :  principles and applications / 
edited by David J. Maguire, Michael F. Goodchild, and David W. Rhind 
 - Harlow, Essex :  Longman Scientific & Technical,  1991 
 - 2 v. :  ill. (some col.), maps (some col.) ;  26 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/> Principles --  Applications.  vol. 1.  vol. 2. 
<br/><br/><label>ISBN: </label>0582056616 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geographic information systems