Kesler, S. (1994). Mineral resources, economics and the environment. New York: MacMillan College Publishing Company, Inc..
Παραπομπή Chicago StyleKesler, Stephen. Mineral Resources, Economics and the Environment. New York: MacMillan College Publishing Company, Inc., 1994.
Παραπομπή MLAKesler, Stephen. Mineral Resources, Economics and the Environment. New York: MacMillan College Publishing Company, Inc., 1994.
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