Subsurface Cambro-Ordovician stratigraphy of northwestern Pennsylvania and bordering states
Publisher: Commonwealth of Pennsylvania, Dept. of Internal Affairs, Topographic and Geological Survey
Published: 1961
Place of publication: [Harrisburg]
Language: eng
Number of pages: 22
Subjects: Geology, Stratigraphic -- Cambrian.; Geology, Stratigraphic -- Ordovician.; Geology -- Pennsylvania.; Geology -- New York (State); Geology -- Mississippi River Valley.
Notes: Bibliography: p. 19-22.
Cover title.
At head of title: Pennsylvania Geological Survey, 4th series.
Part of illustrative matter in pocket.