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You searched for: Creator John N Hoffman Remove constraint Creator: John N Hoffman Publisher Mineral Industries Experiment Station Remove constraint Publisher: Mineral Industries Experiment Station Resource Type Book Remove constraint Resource Type: Book
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  1. Manganese: Its Minerals, Deposits and Uses

    Resource Type: Book
    Creator: John N. Hoffman
    Keyword: Earth and Mineral Sciences Experiment Station Circulars
    Publisher: Mineral Industries Experiment Station
    Object Type: GenericWork
    Date Uploaded: 2014-09-17T22:20:13Z
  2. Future Energy Sources for Pennsylvania

    Resource Type: Book
    Creator: W. Gibson Jaworek, Donald G. Frendel, John N. Hoffman, Robert K. Amole, and John J. Schanz, Jr.
    Keyword: Earth and Mineral Sciences Experiment Station Circulars
    Publisher: Mineral Industries Experiment Station and State Planning Board, Commonwealth of Pennsylvania
    Object Type: GenericWork
    Date Uploaded: 2014-09-17T22:20:15Z