Congreso Geologico Internacional,20º.Mexico,1956 <br/><br/>
Gacetas historicas 

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 - Mexico - MEXI    1956 
 - 80p.  23cm 
 - Congreso Geologico Internacional,20º. Mexico,1956   .
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label>--Geologia--Congresos--