Burchad, Ernest F. <br/><br/>
The production of Iron ore, pig iron an Steel in 1913. 

 - Washington, D.C.  Government Printing Office  1914 
 - pp. 291-338 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA