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Donor
- Laylin, John G. (John Gallup), 1902- 10
Topic
- Water-supply 6
- Irrigation 4
- Politics and government 4
- Agriculture 2
- Canals 2
- Dams 2
- Desertification 1
- Hari Rud 1
- Qanats 1
Region
- Iran 10
- Afghanistan 9
- Russia 2
Decade
- 1940-1949 10