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Region
- MarylandAberdeen Proving Ground3
- Puerto Rico3
- Micronesia2
- VirginiaDahlgren2
- AlaskaKenai River1
- ArizonaOrgan Pipe Cactus National Monument1
- ArizonaQuitobaquito Springs1
- CaliforniaCalaveras County1
- Carbon County (Utah)1
- ColoradoPueblo1
- Connecticut1
- Cumberland Valley (Md. and Pa.)1
- Death Valley (Calif. and Nev.)1
- Edwards Aquifer (Tex.)1
- Florida1
- FloridaDe Soto County1
- FloridaHardee County1
- FloridaHillsborough County1
- FloridaSarasota County1
- FloridaTallahassee1