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Subject
- Boundaries[remove]12
- Environment[remove]12
- Agriculture5
- Ecological zones5
- Farming5
- Land use, Rural4
- Farmland3
- Grazing3
- Air quality management2
- Air quality—Standards2
- Biology and Ecology2
- Biota2
- Cities and towns2
- Climatology, Meteorology and Atmosphere2
- Health2
- Land use, Urban2
- Metropolitan areas2
- Pollution2
- Society2
- Administrative and political divisions1