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Subject
- Boundaries160
- Society105
- School districts97
- Elementary schools78
- High schools70
- Junior high schools70
- Middle schools70
- Oceans59
- Farming54
- Climatology, Meteorology and Atmosphere53
- Sea ice53
- Agriculture50
- Inland Waters48
- Land use47
- Urbanization45
- Rivers35
- Provinces31
- Environment17
- Census11
- Administrative and political divisions10