Conkling, edgar C Thoman, Richard S Yeates, Maurice H <br/><br/>
Geography of economic activity 

 - 2nd ed. 
 - New York  McGraw-Hill book company  1968 
 - xii,561 p.; ill 
<br/><br/><label>ISBN: </label>70642052 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture<br/>Commercial geography<br/>Economic geography<br/>Urban economics