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Subject (Region)
- United States98
- Missouri River Watershed5
- Louisiana3
- Florida2
- Alabama1
- Alabama River Watershed1
- Alaska1
- Apalachicola River Watershed1
- California1
- Canada1
- Chattahoochee River Watershed1
- Coosa River Watershed (Ga. and Ala.)1
- Delaware River Watershed (N.Y.-Del. and N.J.)1
- Everglades1
- Everglades (Fla.)1
- Flint River Watershed1
- Georgia1
- Mississippi River Valley1
- New Orleans1
- Northwest, Pacific1