Duncan, D. C. (1953). Geology and coal deposits in part of the Coos Bay coal field, Oregon: Geological investigations, sample data, and estimated reserves in part of the Coos County coal field. United States Department of the Interior, Geological Survey.
Chicago Style (17th ed.) CitationDuncan, Donald C. Geology and Coal Deposits in Part of the Coos Bay Coal Field, Oregon: Geological Investigations, Sample Data, and Estimated Reserves in Part of the Coos County Coal Field. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1953.
MLA (9th ed.) CitationDuncan, Donald C. Geology and Coal Deposits in Part of the Coos Bay Coal Field, Oregon: Geological Investigations, Sample Data, and Estimated Reserves in Part of the Coos County Coal Field. United States Department of the Interior, Geological Survey, 1953.