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Subject (Region)
- North America[remove]29
- United States5
- Canada3
- Pacific Coast3
- Pacific Coast (North America)3
- Mexican-American Border Region2
- New France2
- Pacific Ocean2
- Rio Grande Valley2
- Rio Grande Valley (Colo.-Mexico and Tex.)2
- Saint Lawrence Seaway2
- Asia1
- Colorado Desert1
- Colorado Desert (Calif. and Mexico)1
- Colorado River1
- Colorado River (Colo.-Mexico)1
- Great Lakes1
- Great Lakes (North America)1
- Hawaii1
- Laguna Atascosa National Wildlife Refuge1