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Subject
Environment
60
Boundaries
47
Inland Waters
32
Biology and Ecology
30
Transportation
29
Biogeography
22
Hydrography
22
Planning and Cadastral
18
Watersheds
18
Rivers
15
Society
14
Census
13
Waterways
13
Habitat (Ecology)
12
Ecological zones
11
Home range (Animal geography)
11
Cities and towns
10
Population
10
Structure
10
Agriculture
9