Roberts, Ralph J.  1911-2007 <br/><br/>
Mineral deposits of Central America / 
by Ralph J. Roberts and Earl M. Irving. 
 -- Washington :   United States Government Printing Office,   1957 
 - 205 p. + map. -- 
 (Geological Survey Bulletin  ; 1034).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Centro América<br/>Depósitos de minerales
<br/><br/><label>Universal Decimal Class. No.: </label>553(72)