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You searched for: Creator Ashley George H Remove constraint Creator: Ashley George H Resource Type Book Remove constraint Resource Type: Book
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  1. PAGS Progress Report no.97

    Resource Type: Book
    Creator: Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:10Z
  2. PAGS Progress Report no.101

    Resource Type: Book
    Creator: Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:10Z
  3. High Spots in Pennsylvania

    Resource Type: Book
    Creator: Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:07Z
  4. Mineral Resources of the Lower Allegheny - Beaver River District

    Resource Type: Book
    Creator: Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:07Z
  5. Pennsylvania, the Makings of a World Power

    Resource Type: Book
    Creator: Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:07Z
  6. The Canadian System

    Resource Type: Book
    Creator: Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:06Z
  7. A Stratigraphic Time Scale

    Resource Type: Book
    Creator: Commonwealth of Pennsylvania and Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:05Z
  8. PAGS Progress Report no.089

    Resource Type: Book
    Creator: Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:04Z
  9. PAGS Progress Report no.088

    Resource Type: Book
    Creator: Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:04Z
  10. The Age and Origin of the Earth

    Resource Type: Book
    Creator: Commonwealth of Pennsylvania and Ashley, George H.
    Keyword: PAGS Progress Reports
    Publisher: Pennsylvania Bureau of Topographic and Geologic Survey
    Object Type: GenericWork
    Date Uploaded: 2014-09-25T00:39:03Z