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Bituminous Coal Fields of Pennsylvania ...: Parts 1-4
Free
Report of Progress
Free
Third [-Fourth, Sixth] Annual Report on the Geological Survey of the State of Pennsylvania (varies Slightly): Volumes 3-5
Free
Report of Progress 1874-1889,A-Z.
Free
Annual Report on the Geological Survey of the State of Pennsylvania
Free
Geological Survey of Pennsylvania: Final Report Ordered by Legislature, 1891. A Summary Description of the Geology of Pennsylvania, Volume 3, Part 2
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Report of Progress 1874-1889, A-Z ...: Page 2
Free
Annual Report on the Geological Survey of Pennsylvania: Volume 3
Free
Geological Survey of Pennsylvania: 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
Free
Final Report Ordered by Legislature, 1891: A General Index of the Final Summary Report of the Geology of Pennsylvania, Volume 0
Free
Report of Progress in the Fayette and Westmoreland District
Free
Annual Report of the Geological Survey of Pennsylvania for ...
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Annual Report of the Geological Survey of Pennsylvania for 1885-1887
Free
The Geology of Lehigh and Northampton Counties
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Geological Survey of Pennsylvania: Laurentian, Huronian, Cambrian and Lower Silurian formations, by J.P. Lesley
Free
Annual Report of the State Geologist ...
Free
A List and Brief Guide to the Publications of the Pennsylvania Geological Survey, 1874-1891
Free
Geological Survey of Pennsylvania: Upper Silurian and Devonian formations, by J.P. Lesley
Free
The Geology of Pennsylvania: A Government Survey, Volume 2, Part 2
Free
Annual Report of the Geological Survey of Pennsylvania....1885-1887: Map and section along the Lehigh River, sheet no. 1
Free