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  1. 1
    Published 2020
    In collection: Published Materials
    Subjects: ';
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    Where are you in the Delaware River watershed?
  2. 2
    Published 1990
    In collection: Published Materials
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    Coal resources of Cambria and Blair Counties, Pennsylvania
  3. 3
    Published 2005
    In collection: Published Materials
    Free eBook from the Internet Archive
    Contributor biographical information
    Publisher description
    Additional information and access via Open Library
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    Atlas of North America /

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