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Author: Butts, Charles, 1863-1946.
Published 1939
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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Author: Butts, Charles, 1863-1946.
Published 1939
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Tyrone quadrangle....”
Book

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Clear Filter Suggested Topics: Mines and mineral resources Clear Filter Author: Geological Survey (U.S.)