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Diagrams showing proposed correlation and nomenclature of Eocene and Paleocene coal beds in the Birney 30' x 60' Quadrangle, Big Horn, Rosebud, and Powder River counties, Montana
Diagrams showing proposed correlation and nomenclature of Eocene and Paleocene coal beds in the Birney 30' x 60' Quadrangle, Big Horn, Rosebud, and Powder River counties, Montana