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Edité par Sacramento State College School of Engineering, Sacramento, California, 1969
Vendeur : Xochi's Bookstore & Gallery, Truth or consequences, NM, Etats-Unis
Livre
Paper Back. Etat : Very Good. No Jacket. unpaginated; unbound pages in 'accordian' folder. Symposium held Oct.16-17, 1969. " .case studies of outstanding underground excavation projects, both mining and construction.the goals are significant rate and cost improvement in the excavation of underground openings: tunnels, shafts, chambers, and mine development workings.".