Hess, Frank L. <br/><br/>
Cobalt, Molybdenum, Nickel, Tantalum, Titanium, Tungsten, Radium, uranium and vanadium in 1921. 

 - Washington, D.C.  Government Printing Office  1922 
 - pp. 207-233 
<br/><br/> Impreso  En biblioteca 2 ejemplares. 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA
<br/><br/><label>Dewey Class. No.: </label>