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1
Geologic papers. : [A Paleozoic section in south central Penna.] /
[Harrisburg, Pa.] : [Dept. of Internal Affairs, Topographic and Geologic Survey], 1938

Book
2
The Pocono Formation in northeastern Pennsylvania; guidebook for the 34th Annual Field Conference of Pennsylvania Geologists, Oct. 3-4, 1969.
by Sevon, William D.
Harrisburg, Pa., Bureau of Topographical and Geologic Survey, Dept. of Environmental Resources, 1969

Conference Proceeding Book
3
The Pocono Formation in northeastern Pennsylvania : guidebook for the 34th Annual Field Conference of Pennsylvania Geologists, October 3 and 4, 1969 /
Harrisburg, Pa. : Bureau of Topographical and Geologic Survey, Dept. of Environmental Resources, 1969

Conference Proceeding Book
4
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
5
Tully (Middle Devonian) to Queenston (Upper Ordovician) correlations in the subsurface of western Pennsylvania /
by Heyman, Louis
Harrisburg : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1977

Book
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