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Coal Resource Classification System of the U.S. Geological Survey

The classification system by which coal is classified into resource/reserve base/reserve categories on the basis of the geologic assurance of the existence of those categories and on the economic feasibility of their recovery.

by Wood, Gordon H.; Kehn, Thomas M.; Carter, M. Devereux; and Culbertson, William C.
U.S. Geological Survey Circular 891
Related topics:
Coal resources, Economic geology, Natural resource assessment, Terminologies and classifications
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