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topic
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Gas wells
Coalfields
1
Coke
1
Geology
1
Mines and mineral resources
1
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name
American Association for the Advancement of Science
1
Bradford, J. N
1
Chamber of Commerce of Pittsburgh
1
Krebs, Otto
1
collection
Maps of North America
2
place
Ohio
1
Pennsylvania
1
Pittsburgh (Pa.)
1
Pittsburgh Region
1
genre
Maps
2
Geological maps
1
Thematic maps
1
publisher
American Association for the Advancement of Science
1
Chamber of Commerce of Pittsburgh
1
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Map Division
type
cartographic
2
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: Gas wells
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Geological map of Ohio, showi…
Pittsburgh & Western Pennsylv…