Proceedings :   Volumen 2 

 - San Francisco :   Pattison, Harry C. AIME 
 - 1843 p. 
<br/><br/>Support systems. Mining projects;Shafts;Legal contract;Civil case histories;Geology and engineering;Underground openings and special tunnel studies;Legal contract;Mine planning;Development of tunneling parameters;Machines;Special techniques 
<br/><br/><label>Subjects--Topical Terms: </label><br/>TUNELES<br/>MINERIA<br/>PUERTO HURON<br/>SUBTERRANEO DE SAN PABLO<br/>EXCAVACIONES<br/>MAQUINAS
<br/><br/><label>Universal Decimal Class. No.: </label>624.19