North American Tunneling Conference Indianapolis, Ind., ebrary, Inc, & Fowler, M. (2012). North American Tunneling: 2012 proceedings. Society for Mining, Metallurgy and Exploration.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorth American Tunneling Conference Indianapolis, Ind., Inc ebrary, और Matthew Fowler. North American Tunneling: 2012 Proceedings. Englewood, Colo.: Society for Mining, Metallurgy and Exploration, 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNorth American Tunneling Conference Indianapolis, Ind., et al. North American Tunneling: 2012 Proceedings. Society for Mining, Metallurgy and Exploration, 2012.
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