Region
- CaliforniaSan Bernardino County1
- DelawareNew Castle County1
- IdahoBoise Region1
- IdahoElmore County1
- IdahoMountain Home Air Force Base1
- Kansas1
- Lockport Group1
- LouisianaNew Orleans Region1
- LouisianaVernon Parish1
- Memphis (Tenn.)1
- Mississippi River Watershed1
- Monument Valley (Ariz. and Utah)1
- NebraskaPlatte River Watershed1
- NevadaHumboldt River Watershed1
- NevadaNye County1
- NevadaYucca Flat Region1
- New JerseyCamden County1
- New JerseyGloucester County1
- OhioDarke County1
- OhioPreble County1