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Geographic Information
- Darlington District, South Carolina, United States6
- Lockport, Niagra County, New York, United States4
- South Carolina, United States4
- West Indies3
- France2
- Mammoth Cave, Edmonson County, Kentucky, United States2
- Massachusetts, United States2
- Roughton Gill Mine, Cumberland, Cumbria, England, United Kingdom2
- Africa1
- Agrigento, Sicily, Italy1
- Boston, Suffolk County, Massachusetts, United States1
- Chester County, Pennsylvania, United States1
- Delaware County, New York, United States1
- Derbyshire, England, United Kingdom1
- Durham1
- Ehrenfriedersdorf, Saxony, Germany1
- Elba Island, Livorno, Tuscany, Italy1
- England, United Kingdom1
- Florida, United States1
- Fowler, St. Lawrence County, New York, United States1