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Dyfyniad Arddull ChicagoRunge, Ian C. Mining Economics and Strategy. Littleton, Colo.: Society for Mining, Metallurgy, and Exploration, 1998.
Dyfyniad MLARunge, Ian C. Mining Economics and Strategy. Society for Mining, Metallurgy, and Exploration, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.