Rubber production in the Amazon Valley 

 - Washington :  Government Printing Office,  1925 
 - 369 p.  : ilus. 
 - Trade promotion series  ; 23 .
 - Trade promotion series  ; 23 .
<br/><br/><label>LCCN: </label>39799 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura--Aspectos economicos--America Latina.<br/>Caucho.<br/>Hevea.
<br/><br/><label>Dewey Class. No.: </label>338.173895  / E8