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1
Greensburg quadrangle; mineral resources /
by Johnson, Meredith E.
Harrisburg : Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey, 1925

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2
Geochemistry of the mafic rocks, Delaware Piedmont and adjacent Pennsylvania and Maryland : confirmation of arc affinity /
Newark, Del. : University of Delaware, 2001

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3
Oil and gas field property line maps of the Hilliards quadrangle, Pennsylvania /
Harrisburg : Pennsylvania Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey, 1946

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4
Glacial deposits outside the Wisconsin terminal moraine in Pennsylvania /
by Leverett, Frank, 1859-1943
Harrisburg, Pa. : Department of internal affairs, Topographic and geologic survey, 1934

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5
Birds of Pennsylvania : natural history and conservation /
by Wakeley, James S., 1950-
Harrisburg, Pa. : Pennsylvania Game Commission, 1985
2nd ed.

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8
Geologic causes and possible preventions of roof fall in room-and-pillar coal mines /
by Kent, Bion H. (Bion Huntley), 1925-
Harrisburg : Pennsylvania Geological Survey : may be purchased from State Book Store, 1974

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9
Greater Pittsburgh region revised surface structure and its relation to oil and gas fields /
by Wagner, Walter Richard, 1928-1974
Harrisburg : Pennsylvania Geological Survey, 1976

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10
Outstanding scenic geological features of Pennsylvania : part 2 /
by Geyer, Alan R.
Harrisburg [Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1987

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11
Ground water in northeastern Pennsylvania /
by Lohman, S. W. (Stanley William), 1907-1992
Harrisburg : Pa. Dept. of Internal Affairs, Topographic and Geologic Survey, 1937

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12
Geological Survey of Pennsylvania. Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania.
Harrisburg, Board of Commissioners for the Geological Survey, 1892

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13
Geology and mineral resources of the Philipsburg 7 1/2-minute quadrangle, Pennsylvania,
by Glass, Gary B.
Harrisburg [Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey] 1974

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14
Special report on the petroleum of Pennsylvania, its production, transportation, manufacture and statistics.
by Wrigley, Henry E.
Harrisburg, Pub. by the Board of commissioners for the Second geological survey, 1875

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15
Geology and mineral resources of Greene county,
by Stone, Ralph W. (Ralph Walter), 1876-1964
Harrisburg, Dept. of internal affairs, Topographic and geologic survey, 1932

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16
The geology of Lancaster county /
by Frazer, Persifor, 1844-1909
Harrisburg : Pub. by the Board of commissioners for the Second geological survey, 1880

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17
The geology of Pittsburgh and its environs: a popular account of the general geological features of the region.
by Leighton, Henry, 1884-
Pittsburgh, Pa., Carnegie museum, Jones' bookshop 1927
Special ed.

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19
Geology and mineral resources of the Bellefonte quadrangle, Pennsylvania /
by Butts, Charles, 1863-1946, Moore, Elwood S., 1878-
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1936

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20
Climatological data.

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