Puerto Rico at work. 

 - [Washington, D.C.  Association of sugar producers of Puerto Rico  1939?] 
 - 36 p.  illus., photos. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sugar trade--Puerto Rico.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Economic conditions.<br/>Puerto Rico--Sugar.