Schroeder, Edward D <br/><br/>
Regional and urban GIS  a decision support approach 
Timothy L. Nyerges, Piotr Jankowski. 
 - USA  McGraw-Hill  c1977 
 - ix,370p.:  ill.;  24cm 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0070556431 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sewage-purification<br/>Water-purification