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Subject
- Environment48
- Boundaries31
- Biology and Ecology25
- Inland Waters20
- Biogeography19
- Watersheds16
- Hydrography13
- Habitat (Ecology)12
- Ecological zones11
- Home range (Animal geography)11
- Agriculture9
- Land use, Rural9
- Cities and towns8
- Farming8
- Metropolitan areas7
- Conservation of natural resources6
- Natural areas6
- Planning and Cadastral6
- Wildland-urban interface6
- Administrative and political divisions5