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Geographic Information
- Darlington District, South Carolina, United States6
- Lockport, Niagra County, New York, United States4
- Mammoth Cave, Edmonson County, Kentucky, United States2
- Roughton Gill Mine, Cumberland, Cumbria, England, United Kingdom2
- 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
- Fowler, St. Lawrence County, New York, United States1
- Germany1
- Greenfield, Saratoga County, New York, United States1
- Gumuch-dagh, Ephesus, Izmir, Turkey1
- Lake Superior1
- Lewes, East Sussex, England, United Kingdom1
- Lyme Regis, Dorset County, England, United Kingdom1
- Maine, United States1