Williamson, G. E., & Gowring, I. M. (1995). Rapid excavation and tunneling conference, San Francisco, California, June 18-21, 1995. Littleton, CO.: Society for Mining, Metallurgy, and Exploration.
Παραπομπή Chicago StyleWilliamson, G. E., and I. M. Gowring. Rapid Excavation and Tunneling Conference, San Francisco, California, June 18-21, 1995. Littleton, CO.: Society for Mining, Metallurgy, and Exploration, 1995.
Παραπομπή MLAWilliamson, G. E., and I. M. Gowring. Rapid Excavation and Tunneling Conference, San Francisco, California, June 18-21, 1995. Littleton, CO.: Society for Mining, Metallurgy, and Exploration, 1995.
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