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Geology
9
Geological surveys
2
Anthracite coal
1
Coal mines and mining
1
Iron
1
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name
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Geological Survey of Pennsylvania
Lesley, J. P. (J. Peter), 1819-1903
9
Hart, Lane S
7
Julius Bien & Co
3
Rogers, Henry D. (Henry Darwin), 1808-1866
2
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Maps of North America
10
place
Pennsylvania
10
Potter County
2
Potter County (Pa.)
2
Allegheny County
1
Allegheny County (Pa.)
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Geological maps
Maps
10
Topographic maps
1
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Geological Survey of Pennsylvania
4
Second Geological Survey of Pennsylvania
4
Geological Survey of Pennsylvania?
1
Pennsylvania Geological Survey
1
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Map Division
10
type
cartographic
10
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Geological map of Berks Count…
Geological map of the environ…
Geological and topographical …
Geological map of Potter Coun…
Geological map of Fayette Cou…
Geological map of Allegheny C…
Geological map of Fulton Coun…
Geological map of Potter Coun…
Geological map of the state o…
m
Geological map of Pennsylvani…