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2
Geologic papers. : [A Paleozoic section in south central Penna.] /
[Harrisburg, Pa.] : [Dept. of Internal Affairs, Topographic and Geologic Survey], 1938

Book
5
A Paleozoic section in south-central Pennsylvania,
by Willard, Bradford, 1894-1973, Cleaves, Arthur B. (Arthur Bailey), 1905-1985
Harrisburg, Pa., Dept. of Internal Affairs, Topographic and Geologic Survey, 1938

Book
6
Geological Survey of Pennsylvania. Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania.
Harrisburg, Board of Commissioners for the Geological Survey, 1892

Book
7
Tully (Middle Devonian) to Queenston (Upper Ordovician) correlations in the subsurface of western Pennsylvania /
by Heyman, Louis
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geologic Survey, 1977

Government Document Book
8
A Paleozoic section at Delaware water gap,
by Willard, Bradford, 1894-1973
Harrisburg, Pa., Dept. of Internal Affairs, Topographic and Geologic Survey, 1938

Government Document Book
10
Geological survey of Pennsylvania. A general index of the Final summary report of the geology of Pennsylvania.
Harrisburg, Board of Commissioners for the Second Geological Survey, 1895

Book
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