Zeller,E.J. <br/><br/>
Modern methods for measurement of geologic time 

 - 
 - California - EEUU  Division of Mines and Geology. Mineral Information Service  1965 
 - 6p.  24cm. Fotocopia 
 - Mineral information service   1965 .
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label>--Edad geologica--Geocronologia--Tiempo geologico--<br/>Geologia