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Subject
- Environment[remove]49
- Biology and Ecology25
- Boundaries24
- Biogeography19
- Inland Waters14
- Watersheds14
- Habitat (Ecology)12
- Ecological zones11
- Home range (Animal geography)11
- Hydrography11
- Agriculture8
- Land use, Rural8
- Farming7
- Conservation of natural resources6
- Metropolitan areas6
- Natural areas6
- Cities and towns5
- Hydrological surveys5
- Land use, Urban5
- Planning and Cadastral5