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Subject
- Environment59
- Biology and Ecology30
- Boundaries29
- Inland Waters29
- Biogeography22
- Hydrography21
- Watersheds18
- Waterways13
- Habitat (Ecology)12
- Rivers12
- Ecological zones11
- Home range (Animal geography)11
- Agriculture9
- Conservation of natural resources9
- Land use, Rural9
- Wildland-urban interface9
- Cities and towns8
- Farming8
- Planning and Cadastral8
- Transportation8