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1
by Hoskins, Donald M., Inners, Jon D., Harper, John A.
Harrisburg, [Pennsylvania] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1988
Third edition, second printing.
Harrisburg, [Pennsylvania] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1988
Third edition, second printing.
Government Document
Book
2
3
by Cozart, Cheryl L.
Harrisburg : Commonwealth of Pennsylvania, Department of Environmental Resources, Office of Parks and Forestry, Bureau of Topographic and Geologic Survey, 1993
Harrisburg : Commonwealth of Pennsylvania, Department of Environmental Resources, Office of Parks and Forestry, Bureau of Topographic and Geologic Survey, 1993
Government Document
Book
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6
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8
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13
by Harper, John A.
[Harrisburg, PA.] : Commonwealth of Pennsylvania, Dept. of Conservation and Natural Resources, Office of Conservation and Engineering Services, Bureau of Topographic and Geologic Survey and Bureau of State Parks, 1998
[Harrisburg, PA.] : Commonwealth of Pennsylvania, Dept. of Conservation and Natural Resources, Office of Conservation and Engineering Services, Bureau of Topographic and Geologic Survey and Bureau of State Parks, 1998
Book
14
15
by Harper, John A.
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Dept. of Conservation and Natural Resources, Office of Conservation and Engineering Services, Bureau of Topographic and Geologic Survey, Office of Parks and Forestry, Bureau of State Parks, 1998
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Dept. of Conservation and Natural Resources, Office of Conservation and Engineering Services, Bureau of Topographic and Geologic Survey, Office of Parks and Forestry, Bureau of State Parks, 1998
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Government Document
Book
16
17
by Dennison, John Manley, 1934-
[S.l. : Harrisburgh, Pa. : s.n.] ; distributed by: Field Conference of Pennsylvania Geologists, 1979
[S.l. : Harrisburgh, Pa. : s.n.] ; distributed by: Field Conference of Pennsylvania Geologists, 1979
Conference Proceeding
Book
18
19
by Harper, John A.
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geological Survey, 1990
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geological Survey, 1990
Government Document
Book
20
by Cozart, Cheryl L.
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1993
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1993
Government Document
Book