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81
by Socolow, Arthur A.
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1960
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1960
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82
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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83
by Dickey, J. B. R.
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geological Survey, 1923
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geological Survey, 1923
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Book
84
by Blodget, Lorin 1823-1901
Harrisburg, [Pa.] : Edwin K. Meyers, State Printer, 1889
Harrisburg, [Pa.] : Edwin K. Meyers, State Printer, 1889
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85
86
87
by Socolow, Arthur A.
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1959
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1959
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88
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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89
by Whipkey, Harry E.
Harrisburg, [Pa.] Pennsylvania Historical and Museum Collection, 1973
Harrisburg, [Pa.] Pennsylvania Historical and Museum Collection, 1973
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90
by Sloto, Ronald A.
Charleston, SC : [R.A. Sloto], 2016
Charleston, SC : [R.A. Sloto], 2016
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Book
91
by Kavanaugh, James
[Phoenix, Ariz.?] : Waterford Press, 2008
[Phoenix, Ariz.?] : Waterford Press, 2008
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Book
92
93
by Poth, Charles W.
Harrisburg, Pa. : Pennsylvania. Bureau of Topographic and Geologic Survey, 1973
Harrisburg, Pa. : Pennsylvania. Bureau of Topographic and Geologic Survey, 1973
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94
by Freeland, David B.
Pittsburgh, Pa., : Audubon Society of Western Pennsylvania, 1975
Pittsburgh, Pa., : Audubon Society of Western Pennsylvania, 1975
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Book
95
by Burt, Laura Knupp
[California, PA : California State College], 1974
[California, PA : California State College], 1974
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Thesis
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96
by Craft, Jesse L.
[S.l.] : N.A.G.T., 1980
[S.l.] : N.A.G.T., 1980
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Book
97
by Thomas, Paul
Edinboro PA : Edinboro University of Pennsylvania, 1992
Edinboro PA : Edinboro University of Pennsylvania, 1992
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Book
98
99
by White, I. C. (Israel Charles), 1848-1927
Washington : Govt. Print. Off., 1891
Washington : Govt. Print. Off., 1891
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100
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.
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