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    Geology of the Huerfano Park area, Huerfano and Custer Counties, Colorado by Johnson, Ross B., 1919-

    Published: U.S. G.P.O., 1959
    Description: iii, 87-119 pages : illustrations, maps ; 24 cm.
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    Geology of the Huerfano Park area, Huerfano and Custer Counties, Colorado
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    Coal resources of the Trinidad coal field in Huerfano and Las Animas counties, Colorado : a resume of the coal resources in an area of 1,100 square miles in south-central Colorado by Johnson, Ross B., 1919-

    Published: U.S. G.P.O. , 1961
    Description: pages iv, 129-180 : illustrations, maps ; 24 cm + 1 folded color map in case.
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    Coal resources of the Trinidad coal field in Huerfano and Las Animas counties, Colorado : a resume of the coal resources in an area of 1,100 square miles in south-central Colorado

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