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Coal
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Geology
1
Oil wells
1
Stratigraphic correlation
1
name
Ashburner, Charles A. (Charles Albert), 1854-1889
2
Bien, Julius, 1826-1909
2
Hart, Lane S
2
Pennsylvania. Board of Commissioners for the Second Geological Survey
2
Lesley, J. P. (J. Peter), 1819-1903
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Maps of North America
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Pennsylvania
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Elk County
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McKean County
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Sergeant (Pa. : Township)
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Sergeant (Township)
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Maps
Charts
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Topographic maps
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Board of Commissioners for the Second Geological Survey
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Map Division
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cartographic
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A series of columnar sections…
Topographical map in thirty-f…