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  1. 1
    The coal fields of the United States /
    Subjects: “...Coal United States....”
    Government Document Book
  2. 2
    The coal fields of Ohio /
    Subjects: “...Coal United States....”
    Government Document Book
  3. 3
    The coal fields of the United States.
    Subjects: “...Coal United States. http://id.loc.gov/authorities/subjects/sh2008101153...”
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    Government Document eBook
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