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Region
- Mars (Planet)30
- California8
- West Virginia8
- ArizonaMohave County7
- Venus (Planet)7
- North Pacific Ocean6
- Colorado5
- Idaho5
- Michigan5
- Ontario5
- Oregon5
- Powder River Basin (Wyo. and Mont.)5
- Saturn (Planet)5
- Wyoming5
- ArizonaCochise County4
- Cascade Range4
- NevadaLincoln County4
- AlaskaAlaska Peninsula Region3
- AlaskaAnchorage Region3
- Appalachian Region3