Cleef, Eugene Van <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/>Trade