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Region
- Montana19
- Arizona7
- California6
- California, Southern6
- Nevada5
- New Mexico5
- Utah4
- Idaho3
- Judith River Formation3
- Lakota Formation3
- California, Northern2
- Magothy Aquifer2
- MarylandAnnapolis Region2
- AlabamaMobile1
- ArizonaYuma Region1
- CaliforniaSanta Barbara County1
- Colorado River (Colo.-Mexico)1
- Florida1
- FloridaLeon County1
- Illinois1