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1
by Dodge, Clifford H.
[Harrisburg: Pennsylvania Geological Survey, 2005
[Harrisburg: Pennsylvania Geological Survey, 2005
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2
Moscow, Idaho : National Gap Analysis Project, 2000
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3
by Shaulis, James R.
[Harrisburg: Pennsylvania Geological Survey, 2007
[Harrisburg: Pennsylvania Geological Survey, 2007
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4
5
6
by Bissell, James K.
Cleveland, Ohio : Pittsburgh, Pa. : Cleveland Museum of Natural History ; Western Pennsylvania Conservancy, 1987
Cleveland, Ohio : Pittsburgh, Pa. : Cleveland Museum of Natural History ; Western Pennsylvania Conservancy, 1987
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7
by McCreath, Andrew S. (Andrew Smith), 1849-, Frazer, Persifor, 1844-1909, Platt, Franklin, 1844-1900, Lesley, J. P. (J. Peter), 1819-1903
Harrisburg : Published by the Board of Commissioners for the Second geological survey, 1879
Harrisburg : Published by the Board of Commissioners for the Second geological survey, 1879
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8
by Lehman, Ambrose E. (Ambrose Edwin), 1851-1917
[Harrisburg, Pa.] : Geological Survey of Pennsylvania, 1875
[Harrisburg, Pa.] : Geological Survey of Pennsylvania, 1875
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9
by Jones, Thomas H. (Thomas Henry), 1912-
Harrisburg, Commonwealth of Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1957
Harrisburg, Commonwealth of Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1957
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10
by Colton, George Willis, 1920-
[Harrisburg, Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1966
[Harrisburg, Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1966
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11
12
by Lesley, J. P. (J. Peter), 1819-1903
Harrisburg, Board of Commissioners for the Second Geological Survey, 1885
Harrisburg, Board of Commissioners for the Second Geological Survey, 1885
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13
Harrisburg, Pa. : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey, 1945
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14
by Dickey, Parke Atherton, 1909-
Harrisburg, Pa. : Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1945
Harrisburg, Pa. : Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1945
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15
by Jones, Thomas H. (Thomas Henry), 1912-
Harrisburg, Commonwealth of Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1957
Harrisburg, Commonwealth of Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1957
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16
17
[Harrisburg, Pennsylvania] : [Published by the Board of Commissioners for the Second Geological Survey], 1875
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18
by Gray, Carlyle
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 Heeren, Lillian A.
Harrisburg, Pa. : Pennsylvania Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey, 1946
Harrisburg, Pa. : Pennsylvania Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey, 1946
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20
by Dickey, Parke Atherton, 1909-
Harrisburg, Pa. : Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1945
Harrisburg, Pa. : Pennsylvania Dept. of Internal Affairs, Topographic and Geologic Survey, 1945
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