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  1. 1
    Surface coal mining in the Northern Great Plains of the western United States : an introduction and inventory utilizing aerial photography collected in 1974 and 1975

    Surface coal mining in the Northern Great Plains of the western United States : an introduction and inventory utilizing aerial photography collected in 1974 and 1975

    Denver, Colo. : U.S. Environmental Protection Agency, Region VIII, Office of Energy Activities, 1976
    Format: Government Document Book


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  2. 2
    A photographic method for determining mineral reflectances in underground mines

    A photographic method for determining mineral reflectances in underground mines by Mayton, Alan G.

    Pittsburgh, Pa. (Cochrans Mill Road, P.O. Box 18070, Pittsburgh, Pa. 15236) : U.S. Dept. of the Interior, Bureau of Mines, 1987
    Format: Government Document Book


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