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Subject
- Boundaries180
- Society126
- School districts98
- Elementary schools78
- High schools70
- Junior high schools70
- Middle schools70
- Oceans61
- Farming54
- Climatology, Meteorology and Atmosphere53
- Sea ice53
- Agriculture50
- Inland Waters49
- Land use48
- Urbanization46
- Rivers35
- Provinces31
- Census21
- Environment20
- Administrative and political divisions10