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1
von Dodge, Clifford H.
[Harrisburg: Pennsylvania Geological Survey, 2005

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Regierungsdokument Buch
2
von Russell, Bill, 1935-
University Park, Pa. : Pennsylvania State University Press, 2006

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Buch
3
Washington, DC : American Chemical Society, 1993

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Buch
4
von Branner, John Casper, 1850-1922
[Philadelphia?, Pa.] : [American Philosophical Society], 1886

Buch
5

Buch
6
von Willard, Bradford, 1894-1973
Harrisburg [Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1976

Regierungsdokument Buch
7
von Ashley, Geo. H. (George Hall), 1866-1951
Harrisburg [Pa.] : Pennsylvania. Bureau of Topographic and Geologic Survey, 1922
2nd ed.

Regierungsdokument Buch
8
von Frazer, Persifor, 1844-1909
Harrisburg [Pa.] : Pub. by the Board of commissioners for the Second geological survey, 1876

Regierungsdokument Buch
9
von Richardson, G. B. (George Burr), 1872-1949
Washington : Govt. Print. Off., 1936

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Regierungsdokument Buch
10
von Sisler, James D. (James Donaldson), 1894-
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geological Survey, 1924

Regierungsdokument Buch
11
[Harrisburg] : The Bureau, 1984

Regierungsdokument Buch
12
von Gray, Carlyle
Harrisburg, [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1958

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Buch
13
Harrisburg, Pa. : Field Conference of Pennsylvania Geologists, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1980

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Tagungsbericht Buch
14
von Rooney, Eric M.
[California, PA : California University of Pennsylvania], 1996

Abschlussarbeit Buch
15
von Ashley, Geo. H. (George Hall), 1866-1951
Harrisburg : Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey, 1969

Regierungsdokument Buch
16

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Zeitschrift
17
von Socolow, Arthur A.
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1961

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Regierungsdokument Buch
18
von MacLachlan, David B.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1975

Regierungsdokument Buch
19
Harrisburg, Pa. : Dept. of the Interior, Geological Survey, Water Resources Division, 1989

Buch
20

Abschlussarbeit Buch