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Subject
- Navigation92
- Land use, Rural39
- Geology27
- Mines and mineral resources17
- Geomagnetism16
- Harbors13
- Groundwater8
- Water table8
- Aquifers7
- Geology, Structural7
- Outdoor recreation7
- Public lands5
- Administrative and political divisions4
- Marine sediments4
- Population4
- Trails4
- Geology, Stratigraphic3
- Nautical charts3
- Ocean bottom3
- Recreational use3
