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Author: Willard, Bradford, 1894-
Published 1932
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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Author: Laird, Wilson Morrow, 1915-
Published 1941
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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Author: Jones, Thomas H. 1912-
Published 1957
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania Maps....”
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