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Subject
- Climatology, Meteorology and Atmosphere96
- Oceans94
- Sea ice94
- Boundaries5
- Inland Waters4
- Public lands4
- Planning and Cadastral3
- Indian reservations2
- Military2
- Protected areas2
- Rivers2
- Society2
- Terrestrial heat flow2
- Transportation2
- Wilderness areas2
- Administrative and political divisions1
- Battlefields1
- Biology and Ecology1
- Cities and towns1
- Drainage1