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  1. 1
    Minerals in the economy of Pennsylvania.
    Published 1978
    Government Document Serial
  2. 2
    1982 census of mineral industries.
    Published 1990
    Government Document Book
  3. 3
    The mineral industry of Pennsylvania.
    Get full text
    Government Document Serial
  4. 4
    A Study of Roof in Pennsylvania Mines Contiguous to Monongahela River.
    Published 1933
    Electronic resource (PDF)
    Government Document eBook
  5. 5
    Carbonizing properties and petrographic composition of Pittsburgh-Ưbed coal from Bureau of Mines Experimental Mine, Bruceton, Allegheny County, Pa.
    Published 1939
    Electronic resource (PDF)
    Government Document eBook
  6. 6
    Horizontal Drilling for Oil in Pennsylvania, A Preliminary Report.
    Published 1944
    Electronic resource (PDF)
    Government Document eBook
  7. 7
    Study of mine roof in coking district of western Pennsylvania.
    Published 1935
    Electronic resource (PDF)
    Government Document eBook
  8. 8
    Analyses of Pennsylvania bituminous coals.
    Published 1939
    Electronic resource (PDF)
    Government Document eBook
  9. 9
    Carbonizing properties and petrographic composition of Pittsburgh-­bed coal from Bureau of Mines Experimental Mine, Bruceton, Allegheny County, Pa.
    Published 1939
    Electronic resource (PDF)
    Government Document eBook
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