The Devonian of Pennsylvania
Subtitle: Middle and upper Devonian
By: by Bradford Willard; Keyser limestone and Helderberg group, by Frank M. Swartz; Oriskany group, by Arthur B. Cleaves.
Contributors: Willard, Bradford, b. 1894.; Swartz, Frank M. 1899-; Cleaves, Arthur B. 1905-
Series: Bulletin G ;; 19
Publisher: Dept. of internatl affairs, Topographic and geologic survey
Published: 1939
Place of publication: Harrisburg, Pa
Language: eng
Number of pages: 481
Subjects: Geology, Stratigraphic -- Devonian.; Geology -- Pennsylvania.; Paleontology -- Devonian.
Notes: Bibliography: p. 434-445.
At head of title: Pennsylvania Geological Survey, Fourth series.