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Subject
Structure
5
Farming
4
Inland Waters
4
Utilities and Communication
4
Agriculture
3
Crops
3
Environment
3
Biology and Ecology
2
Dams
2
Economy
2
Grevy's zebra
2
Water power
2
Camp sites, facilities, etc
1
Drainage
1
Farms
1
Food
1
Hotels
1
Livestock
1
Rivers
1
Tourism
1