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Subject
- Indians of North America5
- Discovery and exploration3
- Railroads3
- Geology2
- Gravity anomalies2
- Landforms2
- Ore deposits2
- Physical geography2
- Russian2
- Coal mines and mining1
- Forest reserves1
- Geological cross sections1
- Geology, Stratigraphic1
- Geomagnetism1
- Gold mines and mining1
- Gold ores1
- History1
- Maps1
- Marine sediments1
- Military bases1
