Subject
Coal mines and mining
2
Coal trade
2
Geology
2
History
2
Windsor Group
2
Anhydrite
1
Appalachian orogeny
1
Chemical analysis
1
Coal fields
1
Economic geology
1
Field trips
1
Geochemistry
1
Geotraverses
1
Guidebooks
1
Gypsum
1
Industrial minerals
1
Meguma Group
1
Mineral industries
1
Mineral resources
Mines
1
Mines and mineral resources
1
Mississipian
1
Mississippian
1
Paleontology
1
Production
1
Stratigraphy
1