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Harrisburg, Pa. : Distributed by Bureau of Topographic and Geologic Survey, Dept. of Environmental Resources, 1973
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Conference Proceeding
Book
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by MacLachlan, David B.
Harrisburg, Pa., Bureau of Topographic and Geologic Survey, Dept. of Internal Affairs, 1966
Harrisburg, Pa., Bureau of Topographic and Geologic Survey, Dept. of Internal Affairs, 1966
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Conference Proceeding
Book
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by Epstein, Jack Burton, 1935-
Harrisburg, Pa. : Bureau of Topographic and Geologic Survey, Dept. of Environmental Resources, 1967
Harrisburg, Pa. : Bureau of Topographic and Geologic Survey, Dept. of Environmental Resources, 1967
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Conference Proceeding
Book
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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
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Conference Proceeding
Book
10
by Sevon, William D.
Harrisburg, Pa., Bureau of Topographical and Geologic Survey, Dept. of Environmental Resources, 1969
Harrisburg, Pa., Bureau of Topographical and Geologic Survey, Dept. of Environmental Resources, 1969
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Conference Proceeding
Book
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