Campbell, Marius R. ; U.S. Geological Survey,
Twentymile Park District of the Yampa Coal Field, Routt County, Colorado: Geological Survey Bulletin 748.
Washington, D.C., U.S. Dept of the Interior, 1923. Trade Paperback., G in Wraps. Lightly Edgeworn, a Few Small Chips & Tears. Pages: 82. Binding Intact.
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