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Subject
- Real property42
- History19
- Historical geography17
- Maps16
- Railroads16
- Aquifers15
- Groundwater15
- Forests and forestry14
- Land capability for agriculture14
- Mines and mineral resources8
- Geology7
- Land grants6
- Administrative and political divisions5
- Roads5
- Streets5
- Oil fields4
- Aeronautical charts3
- Boundaries3
- Colonies3
- Commerce3
