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  1. 1
    2000 resource assessment of selected coal beds and zones in the Northern and Central Appalachian Basin coal regions

    2000 resource assessment of selected coal beds and zones in the Northern and Central Appalachian Basin coal regions

    [Reston, VA] : U.S. Geological Survey, 2001
    Version 1.0.
    Format: Government Document Electronic eBook
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  2. 2
    Map of applied geology - Japan : coal.

    Map of applied geology - Japan : coal.

    Tokyo : Imperial Geological Survey of Japan, 1921
    Format: Map


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