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    Natural gamma aeroradioactivity map of the Pittsburgh area, Pennsylvania, Ohio, West Virginia, and Maryland by Bates, Robert Glenn, 1923-

    Published: U.S. Geological Survey, 1966
    Description: 1 map : color ; 78 x 85 cm.
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    Natural gamma aeroradioactivity map of the Pittsburgh area, Pennsylvania, Ohio, West Virginia, and Maryland
  2. 2

    Map showing depths to the Pittsburgh coal bed, mining activity, and related surface subsidence, Allegheny, Washington, and Westmoreland counties, Pennsylvania by Bushnell, Kent O.

    Published: U.S. Geological Survey, 1975
    Description: 1 map ; 60 x 108 cm.
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    Map showing depths to the Pittsburgh coal bed, mining activity, and related surface subsidence, Allegheny, Washington, and Westmoreland counties, Pennsylvania

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