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Subject
- Environment63
- Boundaries61
- Biology and Ecology28
- Agriculture26
- Farming24
- Inland Waters24
- Planning and Cadastral21
- Biogeography19
- Land use16
- Society16
- Urbanization16
- Watersheds16
- Hydrography14
- Transportation14
- Census13
- Habitat (Ecology)12
- Cities and towns11
- Ecological zones11
- Home range (Animal geography)11
- Land use, Rural11