Contributions to economic geology, 1911, Part II, Mineral fuels--Geologic structure of the Punxsutawney, Curwensville, Houtzdale, Barnesboro, and Patton quadrangles, central Pennsylvania | Zendy

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Contributions to economic geology, 1911, Part II, Mineral fuels--Geologic structure of the Punxsutawney, Curwensville, Houtzdale, Barnesboro, and Patton quadrangles, central Pennsylvania

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