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Subject
Crime
25
Universities and colleges
25
Murder
24
Rape
24
Robbery
24
Criminal statistics
22
Conservation of natural resources
13
Habitat (Ecology)
11
Plants
7
Hydrology
5
Forests and forestry
4
Water
4
Coasts
3
Bogs
2
Education
2
Express highways
2
Floods
2
Prisons
2
Roads
2
Schools
2