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1
Author: Ashley, Geo. H. 1866-1951.
Published 1931
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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2
Author: Butts, Charles, 1863-1946.
Published 1939
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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3
Author: Blackmer, Gale C.
Published 2004
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Chester County....”
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4
Author: Sevon, W. D.
Published 1989
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Pike County....”
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5
Published 1959
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Bucks Co....”
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6
Author: Stone, Ralph W. 1876-1964.
Published 1932
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Greene Co....”
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7
Author: Moyer, Forrest Theodore, 1906-
Published 1937
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Fayette County....”
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8
Author: Butts, Charles, 1863-1946.
Published 1939
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Tyrone quadrangle....”
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9
Author: Clemson, Thomas Green, 1807-1888.
Published 1834
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania York County Surveys....”
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10
Author: Stose, George Willis, 1869-1960.
Published 1932
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Adams County....”
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11
Author: Bascom, F. 1862-1945.
Published 1931
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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