Ullman Edward L <br/><br/>
Geography as spatial interaction. edited by Ronald 

 - Seattle  University of Washington Press         1980 
 - xix,231p.  cm. 
<br/><br/> Bibliography p.223-25; Appendix p.217-22 
<br/><br/><label>ISBN: </label>0295957115 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography-Urban
<br/><br/><label>Dewey Class. No.: </label>U, M0