Geological Survey of Pennsylvania. Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania. - Geological Survey of Pennsylvania; Ingham, William A. (William Armstrong), 1827-1913 (Harrisburg, Board of Commissioners for the Geological Survey, 1892)
v. 1. Laurentian, Huronian, Cambrian and Lower Silurian formations, by J.P. Lesley.--v. 2 Upper Silurian and Devonian formations, by J.P. Lesley.--v. 3. pt. 1. Carboniferous formations, by J.P. Lesley, E.V. d'Invilliers, and A.D.W. Smith. pt. 2. Bituminous coal fields, by E.V. d'Invilliers. The new red of Bucks and Montgomery Counties, by B.S. Lyman.
Keywords: Geology, Stratigraphic -- Paleozoic; Geology -- Pennsylvania; Coal -- Pennsylvania