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- Water-supply 37
- Politics and government 31
- Laylin, John G. (John Gallup), 1902- 16
- Irrigation 13
- Dams 9
- Canals 8
- Agriculture 7
- Treaties 4
- Amini, Ali 3
- Qanats 2
- Buffer states 1
- Building 1
- Calendars 1
- Hari Rud 1
- Measurement 1
- Tipton, R. J. (Royce J.), 1893- 1
- Wars 1