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Geology
name
Geological Survey of Pennsylvania
4
Hart, Lane S
4
Lesley, J. P. (J. Peter), 1819-1903
4
Julius Bien & Co
2
Stevenson, John J. (John James), 1841-1924
2
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Maps of North America
4
place
Pennsylvania
4
Allegheny County
1
Allegheny County (Pa.)
1
Berks County
1
Berks County (Pa.)
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Geological maps
4
Maps
4
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Second Geological Survey of Pennsylvania
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Map Division
type
cartographic
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Geological map of Berks Count…
Geological map of Fayette Cou…
Geological map of Allegheny C…
Geological map of Fulton Coun…