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Region
- California7
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- Idaho3
- MontanaDillon Region3
- AlaskaAnchorage Region2
- Georges Bank2
- MontanaButte Region2
- Pacific Coast (Calif.)2
- Africa, North1
- AlaskaNorth Slope1
- ArizonaGrand Canyon National Park1
- ArizonaPalisades Creek1
- Atlantic Coast (U.S.)1
- Beaufort Sea1
- Black Hills (S.D. and Wyo.)1
- CaliforniaSan Mateo County1
- Colorado1
- Eurasia1
- Europe1
- Fishers Island Sound (Conn. and N.Y.)1