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1
by Dodge, Clifford H.
[Harrisburg: Pennsylvania Geological Survey, 2005
[Harrisburg: Pennsylvania Geological Survey, 2005
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2
by Willard, Bradford, 1894-1973
Harrisburg [Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1976
Harrisburg [Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1976
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3
by Ashley, Geo. H. (George Hall), 1866-1951
Harrisburg [Pa.] : Pennsylvania. Bureau of Topographic and Geologic Survey, 1922
2nd ed.
Harrisburg [Pa.] : Pennsylvania. Bureau of Topographic and Geologic Survey, 1922
2nd ed.
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4
by Frazer, Persifor, 1844-1909
Harrisburg [Pa.] : Pub. by the Board of commissioners for the Second geological survey, 1876
Harrisburg [Pa.] : Pub. by the Board of commissioners for the Second geological survey, 1876
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5
by Richardson, G. B. (George Burr), 1872-1949
Washington : Govt. Print. Off., 1936
Washington : Govt. Print. Off., 1936
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6
by Sisler, James D. (James Donaldson), 1894-
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geological Survey, 1924
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geological Survey, 1924
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7
8
by Ashley, Geo. H. (George Hall), 1866-1951
Harrisburg : Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey, 1969
Harrisburg : Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey, 1969
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9
by Socolow, Arthur A.
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1961
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1961
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10
by MacLachlan, David B.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1975
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1975
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11
Moscow, Idaho : National Gap Analysis Project, 2000
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Map
12
by Lesley, J. P. (J. Peter), 1819-1903
Harrisburg, [Pa.] : Pennsylvania Board of Commissioners for the Geological Survey, 1889
Harrisburg, [Pa.] : Pennsylvania Board of Commissioners for the Geological Survey, 1889
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13
by Shepps, Vincent C. (Vincent Chester), 1928-
[Harrisburg, PA] : Dept. of Internal Affairs, Topographic and Geologic Survey, 1959
[Harrisburg, PA] : Dept. of Internal Affairs, Topographic and Geologic Survey, 1959
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14
15
by Shaulis, James R.
[Harrisburg: Pennsylvania Geological Survey, 2007
[Harrisburg: Pennsylvania Geological Survey, 2007
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16
17
18
by Wagner, Walter Richard, 1928-1974
[Harrisburg, Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1958
[Harrisburg, Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1958
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19
by Bergsten, John M., Heeren, Lillian A.
Harrisburg, Pa., Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1961
Harrisburg, Pa., Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1961
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20
by Socolow, Arthur A.
Harrisburg, Pa. : Pennsylvania. Bureau of Topographic and Geologic Survey, 1960
Harrisburg, Pa. : Pennsylvania. Bureau of Topographic and Geologic Survey, 1960
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