Kesler, S. E. (1994). Mineral resources, economics, and the environment. Macmillan ; Maxwell Macmillan Canada ; Maxwell Macmillan International.
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Dyfyniad Arddull Chicago
Kesler, Stephen E. Mineral Resources, Economics, and the Environment. New York : Toronto : New York: Macmillan ; Maxwell Macmillan Canada ; Maxwell Macmillan International, 1994.
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Dyfyniad MLA
Kesler, Stephen E. Mineral Resources, Economics, and the Environment. Macmillan ; Maxwell Macmillan Canada ; Maxwell Macmillan International, 1994.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.