Hess, Frank L. <br/><br/>
Cobalt, Molybdenum, Tantalum, Titanium, Radium, uranium and vanadium in 1918. 

 - Washington, D.C.  Government Printing Office  1920 
 - pp. 791-817 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA
<br/><br/><label>Dewey Class. No.: </label>