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Subject
- Triangulation11
- Railroads8
- Mexican War, 1846-18487
- Roads6
- Monterrey, Battle of, Monterrey, Mexico, 18465
- Groundwater4
- Indians of North America4
- Upper mantle project4
- Description and travel3
- Maps3
- Sandstone3
- Boundaries2
- Discovery and exploration2
- Geology2
- Railroad land grants2
- Administrative and political divisions1
- Antiquities1
- Biotic communities1
- Cities and towns1
- Colonies1
