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  1. 1
    Reconnaissance in the Rio Grande Coal Fields of Texas, by Thomas Wayland Vaughan. [U.S. Geological Survey Bulletin No. 164.]

    Reconnaissance in the Rio Grande Coal Fields of Texas, by Thomas Wayland Vaughan. [U.S. Geological Survey Bulletin No. 164.]

    Published 1900
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  2. 2
    Sodium sulphate: Its sources and uses, by Roger C. Wells. [U.S. Geological Survey Bulletin 717.].

    Sodium sulphate: Its sources and uses, by Roger C. Wells. [U.S. Geological Survey Bulletin 717.].

    Published 1921
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