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Assessment of coal geology, resources, and reserve base in the Powder River Basin, Wyoming and Montana
1 online resource (6 unnumbered pages) : color illustrations.
Coal Assessment Team, James A. Luppens [and four others].
Title from title screen (viewed on July 10, 2013).
Includes bibliographical references (page [6]).
Fact sheet (Geological Survey (U.S.)) ; 2012-3143