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  1. 1
    Geology and phosphate deposits of the Permian rocks in central western Montana /
    by Swanson, Roger Warren, 1914-
    Published 1973
    Government Document Book
  2. 2
    Mineral resources in Permian rocks of southwest Montana /
    by Swanson, Roger Warren, 1914-
    Published 1970
    Government Document Book
  3. 3
    Mineral resources in Permian rocks of southwest Montana /
    by Swanson, Roger Warren, 1914-
    Published 1970
    Get full text
    Government Document eBook
  4. 4
    Geology and phosphate deposits of the Permian rocks in central western Montana /
    by Swanson, Roger Warren, 1914-
    Published 1973
    Get full text
    Government Document eBook
  5. 5
    Progress report on investigations of western phosphate deposits /
    Get full text
    Government Document eBook
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