Physics of the Earth :  IV the age of the earth. 

 - Washington :  National Research Council,  1931. 
 - 487 p. :  il. ;  25 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geocronología<br/>Datación<br/>Planeta tierra
<br/><br/><label>Subjects--Index Terms: </label>Edad de la tierra 
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Libro
<br/><br/><label>Universal Decimal Class. No.: </label>550.93