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Subject
- Boundaries69
- Inland Waters47
- Transportation43
- Utilities and Communication37
- Oceans35
- Shorelines30
- Structure22
- Society21
- Administrative and political divisions18
- Geoscientific Information17
- Roads16
- Location15
- Coasts14
- Environment14
- Groundwater12
- Hydrogeology12
- Lakes11
- Railroads11
- Basins (Geology)10
- Biology and Ecology10