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  1. 1
    The geological story of Pennsylvania /

    Book
  2. 2
    Rocks and minerals of Pennsylvania /

    Book
  3. 3
    Rocks and minerals of Pennsylvania /
    by Barnes, John Henry, 1946-
    Published 2004

    Government Document Book
  4. 4
    The geological story of Pennsylvania /
    by Barnes, John Henry, 1946-
    Published 2002

    Government Document Book
  5. 5
    The geological story of Pennsylvania /
    by Barnes, John Henry, 1946-
    Published 1996

    Book
  6. 6
    The geological story of Pennsylvania /
    by Barnes, John Henry, 1946-
    Published 2002

    Government Document Book
  7. 7
    Rocks and minerals of Pennsylvania /
    by Barnes, John Henry, 1946-
    Published 2004

    Government Document Book
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