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Author: Sisler, James D. 1894-
Published 1928
Record Source: Published Materials
Subjects and Genres: '; “...Anthracite coal Pennsylvania....”
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Author: Fettke, Charles Reinhard, 1888-1859.
Published 1923
Record Source: Published Materials
Subjects and Genres: '; “...Coal Pennsylvania....”
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Clear Filter Author: Pennsylvania Geological Survey (4th, 1919-)