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Subject
- Roads4
- Geology3
- Railroads3
- Cities and towns2
- Highway planning2
- Indians of North America2
- Petroleum2
- Boundaries1
- Discoveries in geography1
- Discovery and exploration1
- Earth temperature1
- Geothermal resources1
- History1
- Land grants1
- Land use, Rural1
- Magnetic anomalies1
- Maps1
- National parks and reserves1
- Natural gas1
- Oil and gas leases1
