Van Cleef, Eugene,  1887 <br/><br/>
Trade Centers and trade routes / 
Eugene van Cleef 
 - New York :  Appleton century Crofts ,  C 1937 
 - xvi, 307 p. ;  21 cm. 
 - The Century earth science series .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Commerce<br/>Trade routes<br/>Commercial geography