Showing 1 - 2 results of 2 for search 'The Survey :', query time: 0.19s Refine Results
  1. 1
    Geologic map of the Oak Forest quadrangle and part of the Blacksville quadrangle, southwestern Pennsylvania /
    by Roen, John B.
    Published 1972
    “...The Survey,...”
    Government Document Map
  2. 2
    The economic geology of the Upper Freeport coal in northeastern Greene county, Pennsylvania /
    by Skema, V. W. (Viktoras W.)
    Published 1982
    “...Pennsylvania Geological Survey,...”
    Book
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