Hudson, John C. <br/><br/>
Geographical diffusion theory / 
John C. Hudson 
 - Illinois :  Deptment of Geography, Northwestern University,  1972 
 - vi, 179 p. :  ill. ;  23 cm. 
 - Studies in geography ;  no. 19 .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label> USD 4.75 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Culture diffusion<br/>Geography--Study and teaching
<br/><br/><label>Dewey Class. No.: </label>910.182