The Helderberg group from central Pennsylvania to southwestern Virginia,
Swartz, Frank M. 1899-
The Helderberg group from central Pennsylvania to southwestern Virginia, by Frank McKim Swartz ... - State College, Pa., School of mineral industries, 1929. - 1 p. l., 14, [13] p. incl. tables, diagrs. 23 cm. - Bulletin (Pennsylvania State University. Mineral Industries Experiment Station) ; no. 4 .
[pt. 1] "reprinted from the Proceedings of the Pennsylvania academy of science, v. 3, 1929."
Contains references.
gs 31000159
Paleontology--United States.
Paleontology--Devonian.
QE728 / .S9
The Helderberg group from central Pennsylvania to southwestern Virginia, by Frank McKim Swartz ... - State College, Pa., School of mineral industries, 1929. - 1 p. l., 14, [13] p. incl. tables, diagrs. 23 cm. - Bulletin (Pennsylvania State University. Mineral Industries Experiment Station) ; no. 4 .
[pt. 1] "reprinted from the Proceedings of the Pennsylvania academy of science, v. 3, 1929."
Contains references.
gs 31000159
Paleontology--United States.
Paleontology--Devonian.
QE728 / .S9