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topic
Geology
1
name
Geological Survey of Pennsylvania
1
Hart, Lane S
1
Lesley, J. P. (J. Peter), 1819-1903
1
Stevenson, John J. (John James), 1841-1924
1
White, I. C. (Israel Charles), 1848-1927
1
collection
Maps of North America
1
place
x
Allegheny County (Pa.)
Allegheny County
1
Pennsylvania
1
genre
x
Geological maps
Maps
1
publisher
Second Geological Survey of Pennsylvania
1
division
Map Division
1
type
cartographic
1
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: Geological maps
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: Allegheny County (Pa.)
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Geological map of Allegheny C…