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Gas wells
Coalfields
1
Coke
1
Mines and mineral resources
1
Oil fields
1
name
Chamber of Commerce of Pittsburgh
1
Krebs, Otto
1
collection
Maps of North America
1
place
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Pittsburgh Region
Pennsylvania
1
Pittsburgh (Pa.)
1
genre
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Maps
Thematic maps
1
publisher
Chamber of Commerce of Pittsburgh
1
division
Map Division
1
type
cartographic
1
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Pittsburgh & Western Pennsylv…