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Subject (Region)
- United States24
- Soviet Union4
- Russia (Federation)3
- Alberta2
- Brazil2
- California2
- Canada2
- China2
- Malaysia2
- Oldman River Dam (Alta.)2
- Spain2
- USA2
- Amity (Washington County : Township)1
- Amity (Washington County, Pa. : Township)1
- Baltic Sea1
- Bordeaux Region (Nouvelle-Aquitaine)1
- Cuba1
- England1
- European Union countries1
- États-Unis1