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Donor
- Laylin, John G. (John Gallup), 1902- 59
Topic
- Water-supply 37
- Politics and government 31
- Laylin, John G. (John Gallup), 1902- 18
- Irrigation 14
- Dams 8
- Agriculture 7
- Canals 7
- Treaties 5
- Amini, Ali 3
- Qanats 2
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Region
- Iran 59
- Afghanistan 54
- Iraq 2
- Russia 2
- United States 2
- Jordan 1
- Qatar 1
- Saudi Arabia 1
- Syria 1
- Turkey 1
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