Johnston, R. J. (Ronald John) <br/><br/>
Spatial structures  introducing the study of spatial systems in human geography 
/ by R. J. Johnston 
 - London  Methuen  1973 
 - x, 137 p. : illus. ; 24 cm. 
<br/><br/>Bibliography: p. 114-126. 
<br/><br/><label>ISBN: </label>0416766501 
<br/><br/><label>LCCN: </label>73-179474 //r903 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Human geography<br/>Spatial systems