The Helderberg group from central Pennsylvania to southwestern Virginia, by Frank McKim Swartz ...
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TextSeries: Bulletin (Pennsylvania State University. Mineral Industries Experiment Station) ; no. 4Publication details: State College, Pa., School of mineral industries, 1929.Description: 1 p. l., 14, [13] p. incl. tables, diagrs. 23 cmSubject(s): LOC classification: - QE728 .S9
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[pt. 1] "reprinted from the Proceedings of the Pennsylvania academy of science, v. 3, 1929."
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