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Published 1887
Record Source: Published Materials
Subjects and Genres: '; “...Coal mines and mining Pennsylvania....”
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Author: Ashburner, Charles A. 1854-1889.
Published 1883
Record Source: Published Materials
Subjects and Genres: '; “...Coal mines and mining Pennsylvania....”
Internet Archive, State Library of Pennsylvania
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Clear Filter Author: Pennsylvania. Board of Commissioners for the Second Geological Survey