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Subject (Region)
- United States135
- Alabama7
- Anniston7
- Chesapeake Bay (Md. and Va.)4
- Alaska2
- Europe2
- European Union countries2
- Georgia2
- Great Lakes (North America)2
- Saint Lawrence Island2
- United States2
- Buffalo1
- California1
- Canada1
- European Economic Community countries1
- Germany1
- Great Lakes1
- Great Lakes Region1
- Great Lakes Region (North America)1
- Illinois1