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Subject
- Boundaries[remove]3
- Ecological zones[remove]3
- Environment3
- Biogeography2
- Biology and Ecology2
- Biotic communities2
- Agriculture1
- Biodiversity1
- Cities and towns1
- Conservation of natural resources1
- Endangered plants1
- Endangered species1
- Land use, Rural1
- Land use, Urban1
- Landscape assessment1
- Metropolitan areas1
- Natural areas1
- Wilderness areas1
- Wildland-urban interface1