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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: Itter, Harry Augustus, 1899-
Published 1938
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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3
Author: Leverett, Frank, 1859-1943.
Published 1934
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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4
Author: Behre, Chas. H.
Published 1927
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Northampton Co....”
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5
Author: Willard, Bradford, 1894-1973.
Published 1938
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Harrisburg area....”
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6
Author: Greenman, D. W.
Published 1955
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Bucks Co....”
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