Roberts, R. C. <br/><br/>
Soil survey of Puerto Rico 

 - Washington :  Superintendent of Documents,  1942 
 - 503 p.  : ilus. ; mapas 
 - USDA. Series 1936  ; 8 .
 - USDA. Series 1936  ; 8 .
<br/><br/><label>LCCN: </label>49346 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos--Puerto Rico.
<br/><br/><label>Dewey Class. No.: </label>631.4  / R6