Subject search: "Coal -- Great Plains"
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A Summary of the U.S. Geological Survey 1999 Resource Assessment of Selected Coal Zones in the Northern Rocky Mountains and Great Plains Region, Wyoming, Montana, and North DakotaA Summary of the U.S. Geological Survey 1999 Resource Assessment of Selected Coal Zones in the Northern Rocky Mountains and Great Plains Region, Wyoming, Montana, and North Dakota, Website or Online Data
by Ellis, Margaret S.