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topic
Coal
1
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
1
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Maps of North America
2
place
Pennsylvania
2
Elk County
1
McKean County
1
Sergeant (Pa. : Township)
1
Sergeant (Township)
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genre
Maps
2
Charts
1
Diagrams
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Geological cross-sections
1
Topographic maps
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Board of Commissioners for the Second Geological Survey
division
Map Division
2
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cartographic
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A series of columnar sections…
Topographical map in thirty-f…