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Oil wells
Stratigraphic correlation
1
name
Ashburner, Charles A. (Charles Albert), 1854-1889
1
Bien, Julius, 1826-1909
1
Hart, Lane S
1
Lesley, J. P. (J. Peter), 1819-1903
1
Pennsylvania. Board of Commissioners for the Second Geological Survey
1
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Maps of North America
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Pennsylvania
Elk County
1
McKean County
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Diagrams
Charts
1
Geological cross-sections
1
Maps
1
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Board of Commissioners for the Second Geological Survey
1
division
Map Division
1
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cartographic
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