A treatise on metal mining / 
 Metal mining 
Prepared for students of the international correspondence schools, scranton, pa. 
 - 7 volúmenes 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ingeniería de minas<br/>Minas y riquezas minerales
<br/><br/><label>LC Class. No.: </label>TN146  / T74