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Subject
- Navigation284
- Harbors25
- Nautical charts18
- Forest reserves9
- Land use7
- Railroads6
- Recreation areas6
- Transportation5
- Intracoastal waterways4
- Outdoor recreation4
- Coasts3
- Environmental aspects3
- Offshore oil industry3
- Offshore oil well drilling3
- Surveys3
- Wilderness areas3
- Environmental impact statements2
- Erosion2
- Geomagnetism2
- Magnetic anomalies2
