TY - BOOK ED - American Institute of Mining, Metallurgical and Petroleum Engineers ED - Rapid Excavation and Tunneling Conference (1974 June 24-27 : San Francisco, California) TI - Proceedings : : Volumen 2 CY - San Francisco : PB - Pattison, Harry C. AIME KW - TUNELES KW - MINERIA KW - PUERTO HURON KW - SUBTERRANEO DE SAN PABLO KW - EXCAVACIONES KW - MAQUINAS N1 - 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 ER -