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Subject (Region)
- Northwest, Canadian[remove]122
- Canada59
- Manitoba12
- Northwestern States11
- Northwest Passage9
- Saskatchewan River (Sask. and Man.)8
- Oregon7
- North Dakota6
- Columbia River5
- Columbia River Valley5
- Missouri River5
- Red River of the North5
- British Columbia4
- Canada, Western4
- Northwest, Pacific4
- Minnesota3
- New France3
- West (U.S.)3
- Alberta2
- Arctic Coast (Canada)2