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Region
- Montana18
- California8
- Arizona7
- Nevada6
- California, Southern5
- New Mexico5
- California, Northern3
- Idaho3
- Judith River Formation3
- Lakota Formation3
- Utah3
- Arkansas2
- Magothy Aquifer2
- MarylandAnnapolis Region2
- Oregon2
- AlabamaMobile1
- AlaskaGlacier Bay1
- CaliforniaBonsall Region1
- CaliforniaSan Diego County1
- CaliforniaSan Luis Rey River Valley1