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1
by Griscom, John H. (John Hoskins), 1809-1874
New York : Harper & Brothers, 1839
New York : Harper & Brothers, 1839
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Book
2
3
by Luttringer, Leo A.
Harrisburg : Pennsylvania Game Commission, 1970
Sixth revised and enlarged edition.
Harrisburg : Pennsylvania Game Commission, 1970
Sixth revised and enlarged edition.
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Book
4
5
by Jennings, O. E. (Otto Emery), 1877-1964
[Place of publication not identified] : Western Pennsylvania Conservancy, 1965
2nd. edition.
[Place of publication not identified] : Western Pennsylvania Conservancy, 1965
2nd. edition.
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Book
6
by Smith, Ned
[Harrisburg, Pa.] : [Pennsylvania Game Commission], 1971
[Harrisburg, Pa.] : [Pennsylvania Game Commission], 1971
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Book
7
by Carswell, Louis D.
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1963
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1963
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Book
8
9
10
by Pomeroy, John S., 1929-
Washington : U.S. Govt. Print. Off, 1980
Washington : U.S. Govt. Print. Off, 1980
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Government Document
Book
11
by Epstein, Jack Burton, 1935-
Washington : Alexandria, VA : U.S. G.P.O. ; For sale by Distribution Branch, U.S. Geological Survey, 1984
Washington : Alexandria, VA : U.S. G.P.O. ; For sale by Distribution Branch, U.S. Geological Survey, 1984
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Government Document
Book
12
by Gentry, Thomas G. (Thomas George), 1843-1905
Philadelphia : Published by the author, 1876
Philadelphia : Published by the author, 1876
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Book
13
by Shirey, George Sutton
Ann Arbor, Mich. : University Microfilms, 1970
Ann Arbor, Mich. : University Microfilms, 1970
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Thesis
Book
14
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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Government Document
Book
15
by Hosterman, John W. (John Wallace), 1923-
Washington : Alexandria, VA : U.S. G.P.O. ; For sale by the Distribution Branch, U.S. Geological Survey, 1984
Washington : Alexandria, VA : U.S. G.P.O. ; For sale by the Distribution Branch, U.S. Geological Survey, 1984
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Government Document
Book
16
by Buckwalter, Tracy V. (Tracy Vere), 1918-
[Harrisburg] : Pennsylvania Bureau of Topographic and Geologic Survey, 1962
[Harrisburg] : Pennsylvania Bureau of Topographic and Geologic Survey, 1962
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Book
17
by Lash, Gary George
Washington : Alexandria, Va. : U.S. G.P.O. ; For sale by the Branch of Distribution, U.S. Geological Survey, 1984
Washington : Alexandria, Va. : U.S. G.P.O. ; For sale by the Branch of Distribution, U.S. Geological Survey, 1984
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18
by Roddy, H. Justin (Henry Justin), 1856-1943
Lancaster, Pa. : Science press, 1928
Lancaster, Pa. : Science press, 1928
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Book
19