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Author: Lohman, S. W. 1907-1992.
Published 1937
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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Author: Leggette, R. M. 1899-
Published 1936
Record Source: Published Materials
Subjects and Genres: '; “...Geology Pennsylvania....”
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Clear Filter Author: Foster, Margaret Dorothy, 1895-