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Coal resources of Colorado / by E.R. Landis.

Edwin R Landis (Edwin Robert), 1926- [author] Geological Survey (U.S.), issuing body.

Washington, D.C. : United States Department of the Interior, Geological Survey 1959

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Coal resources of Colorado / by Frank D. Spencer and Margaret I. Erwin.

Frank Darwyn Spencer 1904- [author] Margaret I. Erwin [author]

Washington, D.C. : United States Department of the Interior, Geological Survey 1953

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3
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Comparison of computer-based and manual coal resource estimation methods for the Cache coal bed, Recluse Geologic Model Area, Wyoming / by Gary B. Schneider, Sharon S. Crowley, and Mary Alice Carey.

Gary B Schneider Sharon S Crowley

Washington, D.C.? : Dept. of the Interior, U.S. Geological Survey 1984

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4
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Coal resources of the Trinidad coal field in Huerfano and Las Animas Counties, Colorado / by Ross B. Johnson.

Ross B. Johnson 1919- [author] Geological Survey (U.S.), issuing body.

Washington, D.C. : United States Department of the Interior, Geological Survey 1961

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5
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Book
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An Assessment of development and production potential of federal coal leases.

United States. Congress. Office of Technology Assessment.

Washington, D.C. : Congress of the U.S., Office of Technology Assessment : For sale by the Supt. of Docs., U.S. G.P.O. 1981-<1982>

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6
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Coal resources of Trinidad-Aguilar area, Las Animas and Huerfano Counties, Colorado / R.L. Harbour and G.H. Dixon.

R. L. Harbour [author] G. H Dixon (George Harvey), 1925- [author]

Washington, D.C. : United States Department of the Interior, Geological Survey 1959

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