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topic
Coal
1
Geology
1
name
x
Geological Survey of Pennsylvania
Hart, Lane S
2
Lesley, J. P. (J. Peter), 1819-1903
2
White, I. C. (Israel Charles), 1848-1927
2
Stevenson, John J. (John James), 1841-1924
1
collection
Maps of North America
2
place
x
Allegheny County (Pa.)
Allegheny County
2
Pennsylvania
2
genre
Maps
2
Geological maps
1
publisher
x
Second Geological Survey of Pennsylvania
division
Map Division
2
type
cartographic
2
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Geological map of Allegheny C…
Map of North Allegheny, showi…