The progress of Puerto Rico, U.S.A. 

 - San Juan  s.n.  [1950?] 
 - 55 p. 
<br/><br/><label>LCCN: </label>53020927 /L 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Economic conditions--1918-
<br/><br/><label>LC Class. No.: </label>HC157.P8  / G6 
<br/><br/><label>Dewey Class. No.: </label>330.97292