Lower Middle Ordovician of south-central Pennsylvania
Published: 1949
Place of publication: [n.p
Language: eng
Number of pages: 779
Subjects: Geology -- Pennsylvania.; Geology, Stratigraphic -- Ordovician.
Notes: "References cited": p. 778-779.
Thesis--Columbia Univ.
Cover title.
"Reprinted from the Bulletin of the Geological Society of America, vol. 60 ... (1949)"
Vita.