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Coalfields
1
Coke
1
Gas wells
1
Mines and mineral resources
1
Oil fields
1
name
Chamber of Commerce of Pittsburgh
1
Krebs, Otto
1
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Maps of North America
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Pennsylvania
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Pittsburgh (Pa.)
1
Pittsburgh Region
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Chamber of Commerce of Pittsburgh
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Map Division
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cartographic
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Natural gas
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: Chamber of Commerce of Pittsburgh
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Pittsburgh & Western Pennsylv…
topic:
Gas
wells