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1
Bedrock geologic map, coal-resource maps, and digital datasets of the Kersey quadrangle, Elk and Clearfield counties, Pennsylvania /
af Dodge, Clifford H.
[Harrisburg: Pennsylvania Geological Survey, 2005

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Government Document Bog
2
Field guide to wild mushrooms of Pennsylvania and the Mid-Atlantic /
af Russell, Bill, 1935-
University Park, Pa. : Pennsylvania State University Press, 2006

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3
Environmental geochemistry of sulfide oxidation /
Washington, DC : American Chemical Society, 1993

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4
Glaciation of parts of the the Wyoming and Lackawanna Valleys. : Read before the American Philosophical Society, February 19, 1886.
af Branner, John Casper, 1850-1922
[Philadelphia?, Pa.] : [American Philosophical Society], 1886

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5
Three scientists of Chester County /

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6
Pennsylvania geology summarized /
af Willard, Bradford, 1894-1973
Harrisburg [Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1976

Government Document Bog
7
The story of the Pennsylvania Survey /
af Ashley, Geo. H. (George Hall), 1866-1951
Harrisburg [Pa.] : Pennsylvania. Bureau of Topographic and Geologic Survey, 1922
2nd ed.

Government Document Bog
8
Report of progress in the district of York and Adams counties : illustrated by maps and cross-sections, showing the iron ore belts and individual mines ; with descriptions of the same, notes of a transit line to establish altitudes, and a catalogue of specimens collected and placed in the museum at Harrisburg /
af Frazer, Persifor, 1844-1909
Harrisburg [Pa.] : Pub. by the Board of commissioners for the Second geological survey, 1876

Government Document Bog
9
Geology and mineral resources of the Butler and Zelienople quadrangles, Pennsylvania /
af Richardson, G. B. (George Burr), 1872-1949
Washington : Govt. Print. Off., 1936

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10
Coal reserves in Jefferson County, Pennsylvania /
af Sisler, James D. (James Donaldson), 1894-
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geological Survey, 1924

Government Document Bog
11
Raymond B. Winter State Park, Union County : scenery, rocks, and springs in eastern Brush Valley /
[Harrisburg] : The Bureau, 1984

Government Document Bog
12
Geology of the Richland quadrangle,
af Gray, Carlyle
Harrisburg, [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1958

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13
Land use and abuse, the Allegheny County problem : guidebook for the 45th annual field conference of Pennsylvania geologists /
Harrisburg, Pa. : Field Conference of Pennsylvania Geologists, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1980

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Conference Proceeding Bog
14
An overview of the geology and hydrogeology of the Wyoming-Lackawanna Basin (northeastern Pennsylvania) /
af Rooney, Eric M.
[California, PA : California University of Pennsylvania], 1996

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15
Geology and mineral resources of the Punxsutawney quadrangle, Pennsylvania /
af Ashley, Geo. H. (George Hall), 1866-1951
Harrisburg : Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey, 1969

Government Document Bog
16
Bulletin ...

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Tidsskrift
17
Geologic interpretation of aeromagnetic map Sassamansville Quadrangle /
af Socolow, Arthur A.
Harrisburg, Pa. : Pennsylvania Topographic and Geologic Survey, 1961

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18
Geology and mineral resources of the Sinking Spring quadrangle, Berks and Lancaster counties, Pennsylvania /
af MacLachlan, David B.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1975

Government Document Bog
19
Water-resources activities of the U.S. Geological Survey in Pennsylvania, 1988-89 /
Harrisburg, Pa. : Dept. of the Interior, Geological Survey, Water Resources Division, 1989

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20
Status of tree bats in Pennsylvania with special reference to Forest County /

Thesis Bog
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