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Subject
Environment
76
Boundaries
56
Planning and Cadastral
36
Transportation
36
Biology and Ecology
35
Biogeography
34
Inland Waters
32
Imagery and Base Maps
29
Hydrography
22
Geoscientific Information
19
Watersheds
18
Oceans
17
Ocean bottom
15
Rivers
15
Society
15
Habitat (Ecology)
14
Census
13
Waterways
13
Coasts
12
Ecological zones
12