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Geology
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Geological Survey of Pennsylvania
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
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place
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Allegheny County
Allegheny County (Pa.)
1
Pennsylvania
1
genre
Geological maps
1
Maps
1
publisher
Second Geological Survey of Pennsylvania
1
division
Map Division
1
type
cartographic
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Geological map of Allegheny C…