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Subject (Region)
- United States200
- Connecticut5
- Europe5
- New Haven5
- Alaska2
- Australia2
- California2
- England2
- European Union countries2
- Germany2
- Maryland2
- Rockville2
- Arctic Ocean1
- Canada1
- Chesapeake Bay (Md. and Va.)1
- Chesapeake Bay Watershed (Md. and Va.)1
- Delaware River Watershed1
- Delaware River Watershed (N.Y.-Del. and N.J.)1
- European Economic Community countries1
- France1