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You searched for: Creator HB Northrup Remove constraint Creator: HB Northrup Keyword earth and mineral sciences experiment station circulars Remove constraint Keyword: earth and mineral sciences experiment station circulars Resource Type Book Remove constraint Resource Type: Book
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  1. Mineral Industries Correspondence and Extension Class Instruction

    Resource Type: Book
    Creator: Edward Steidle and H.B. Northrup
    Keyword: Earth and Mineral Sciences Experiment Station Circulars
    Publisher: Pennsylvania State University
    Object Type: GenericWork
    Date Uploaded: 2014-09-17T22:19:49Z

  2. Circular 18

    Resource Type: Book
    Creator: H.B. Northrup and Edward Steidle
    Keyword: Earth and Mineral Sciences Experiment Station Circulars
    Publisher: Pennsylvania State University
    Object Type: GenericWork
    Date Uploaded: 2014-09-17T22:19:49Z

  3. Circular 24

    Resource Type: Book
    Creator: H.B. Northrup and Edward Steidle
    Keyword: Earth and Mineral Sciences Experiment Station Circulars
    Publisher: Pennsylvania State University
    Object Type: GenericWork
    Date Uploaded: 2014-09-17T22:19:55Z

  4. Correspondence and Extension-Class Instruction

    Resource Type: Book
    Creator: Edward Steidle and H.B. Northrup
    Keyword: Earth and Mineral Sciences Experiment Station Circulars
    Publisher: Pennsylvania State University
    Object Type: GenericWork
    Date Uploaded: 2014-09-17T22:19:56Z