... The twentymile park district of the Yamps coal field, Routt county, Colorado, by Marius R. Campbell.
Material type:
TextSeries: U.S. Geological survey. Bulletin 748Publication details: Washington, Govt. Print. Off., 1923.Description: iv, 82 p. XIII pl. (part. fold.; incl. map. diagrs.) tables, diagrs. 23 cmSubject(s): LOC classification: - QE75 .B9 no. 748
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At head of title: Department of the Interior.
Map folded in pocket.
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