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Subject (Region)
- North America107
- United States19
- Europe14
- Canada9
- Great Lakes (North America)8
- Japan5
- Mexico5
- South America5
- Asia4
- Great Lakes Region (North America)4
- Pacific Area4
- Central America3
- Saint Lawrence Seaway3
- Canada, Northern2
- Former Soviet republics2
- Texas2
- Caribbean Area1
- Conditions économiques1
- Conditions sociales1
- Detroit River (Mich. and Ont.)1