Preston, R. B. <br/><br/>
The postal history of Puerto Rico 
R.B. Preston and M.H. Sanborrn. 
 - Maryland  American Philatelic Society  1950. 
 - 100 p.  ill., facims, map, tables. 
<br/><br/><label>LCCN: </label>fel36001573  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Postage--stamps--Puerto Rico.<br/>Postal service--History.--Puerto Rico
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico