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Subject
- Boundaries62
- Planning and Cadastral58
- Geoscientific Information40
- Transportation39
- Environment38
- Oceans38
- Counties31
- Society24
- Economy22
- Inland Waters17
- Administrative and political divisions13
- Biology and Ecology12
- Geomagnetism10
- Location9
- Minerals9
- Mines and mineral resources9
- Power resources9
- States7
- Drainage6
- Dredging6