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Subject
Environment
16
Biology and Ecology
10
Biogeography
8
Boundaries
8
Hydrography
8
Conservation of natural resources
7
Inland Waters
7
Planning and Cadastral
7
Rivers
6
Waterways
6
Endangered species
5
Ecological zones
4
Riparian restoration
4
Watersheds
4
Biotic communities
3
Bodies of water
3
Lakes
3
Location
3
Natural areas
3
Ponds
3