Eckel, Edwin Butt  1906-1989 <br/><br/>
Geology and mineral resources of Paraguay a reconnaissance / 
by Edwin B. Eckel. 
 -- Washington :   United States Government Printing Office,   1959 
 - 110 p. + [2] h. de map. -- 
 (Geological Survey Professional Paper  ; 327).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geología<br/>Paraguay
<br/><br/><label>Universal Decimal Class. No.: </label>55(892)