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Region
- Mars (Planet)31
- Powder River Basin (Wyo. and Mont.)18
- ArizonaMohave County9
- West Virginia9
- California8
- Venus (Planet)7
- Appalachian Basin6
- Idaho6
- KansasAnderson County6
- North Pacific Ocean6
- Oregon6
- WyomingAlbany County6
- AlaskaAnchorage Region5
- ArizonaCochise County5
- CaliforniaSan Mateo County5
- Cascade Range5
- Colorado5
- Michigan5
- New York (State)Glens Falls Region5
- Ontario5