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  1. 21
    Coal resources of Butler County, Pennsylvania /
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    Government Document eBook
  2. 22
    Diamond-drill exploration of the Dillsburg magnetite deposits, York County, Pennsylvania /
    by Hotz, Preston Enslow, 1913-
    Published 1951
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    Government Document eBook
  3. 23
    Hydraulic mine filling; its use in Pennsylvania anthracite fields, preliminary report.
    Published 1913
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    Government Document eBook
  4. 24
    Constitution diagrams of Pennsylvania anthracite /
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    Government Document eBook
  5. 25
    Geologic investigation of the Boyertown magnetite deposits in Pennsylvania /
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    Government Document eBook
  6. 26
    Some Structural Features of the Northern Anthracite Coal Basin, Pennsylvania.
    Published 1940
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    Government Document eBook
  7. 27
    Geology of the Hanover-York District, Pennsylvania.
    Published 1944
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    Government Document eBook
  8. 28
    Geology and mineral resources of Middletown quadrangle, Pa.
    Published 1933
    Electronic resource (PDF)
    Government Document eBook
  9. 29
    Geology and mineral resources of Bellefonte quadrangle, Pennsylvania.
    Published 1936
    Electronic resource (PDF)
    Government Document eBook
  10. 30
    Geology and mineral resources of Butler and Zelienople quadrangles.
    Published 1936
    Electronic resource (PDF)
    Government Document eBook
  11. 31
    Geology and mineral resources of Honeybrook and Phoenixville quadrangles, Pennsylvania.
    Published 1938
    Electronic resource (PDF)
    Government Document eBook
  12. 32
    Suspended-sediment yields from an unmined area and from mined areas before and after reclamation in Pennsylvania, June 1978-September 1983 /
    by Reed, Lloyd A., Hainly, Robert A.
    Published 1989
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    Government Document eBook
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