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Donor
- Laylin, John G. (John Gallup), 1902- 8
Topic
- Canals 8
- Dams 7
- Irrigation 4
- Agriculture 2
- Water-supply 2
- Building 1
- Hari Rud 1
- Politics and government 1
Region
- Afghanistan 8
- Iran 7
- Russia 1
- United States 1
Rights
- In Copyright 8