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- United States -- Exploring expeditions[remove]21
- Botany -- Southwest, New.8
- Geology -- Southwest, New8
- Mexico -- Boundaries -- United States8
- Rio Grande8
- United States -- Boundaries -- Mexico8
- Zoology -- Southwest, New.8
- Colorado River (Colo.-Mexico)3
- Amazon River Valley2
- Bolivia -- Description and travel2
- Brazil -- Description and travel2
- Montana -- Description and travel2
- Peru -- Description and travel2
- Yellowstone National Park.2
- Arizona -- Description and travel1
- Arizona -- Description and travel.1
- California, Gulf of (Mexico)1
- Colorado River (Colo.-Mexico) -- Description and travel.1
- Dead Sea (Israel and Jordan)1
- Geology -- Montana1