North American Tunneling Conference Indianapolis, Ind., ebrary, Inc, & Fowler, M. (2012). North American Tunneling: 2012 proceedings. Society for Mining, Metallurgy and Exploration.
Dyfyniad Arddull ChicagoNorth American Tunneling Conference Indianapolis, Ind., Inc ebrary, and Matthew Fowler. North American Tunneling: 2012 Proceedings. Englewood, Colo.: Society for Mining, Metallurgy and Exploration, 2012.
Dyfyniad MLANorth American Tunneling Conference Indianapolis, Ind., et al. North American Tunneling: 2012 Proceedings. Society for Mining, Metallurgy and Exploration, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.