summary description of the geology of Pennsylvania
Subtitle: final report ordered by Legislature, 1891.
Contributors: Ingham, William Armstrong, 1827-1913; Pennsylvania. State Geologist (1874-1890)  Geological survey of Pennsylvania
Publisher: Board of Commissioners for the Geological Survey
Published: 1892
Place of publication: Harrisburg
Subjects: Coal -- Pennsylvania; Geology -- Pennsylvania; Geology, Stratigraphic -- Paleozoic