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1by Condra, Geo. E. (George Evert), 1869-1958Subjects: “...Geology, Stratigraphic Carboniferous....”
Published 1935
Book -
2by Branson, E. B. (Edwin Bayer), 1877-1950Subjects: “...Geology, Stratigraphic Carboniferous....”
Published 1938
Book