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Donor
- Laylin, John G. (John Gallup), 1902- 54
Topic
- Water-supply 37
- Politics and government 30
- Laylin, John G. (John Gallup), 1902- 16
- Irrigation 14
- Agriculture 7
- Dams 7
- Canals 6
- Treaties 4
- Amini, Ali 3
- Qanats 2
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Region
- Iran 54
- Afghanistan 53
- United States 2
- Russia 1
- United Kingdom 1
Water Basin
- Helmand Rōd >> Afghanistan 54