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- Water-supply 52
- Politics and government 35
- Irrigation 23
- Laylin, John G. (John Gallup), 1902- 18
- Agriculture 11
- Dams 11
- Canals 8
- Treaties 8
- Water diversion 7
- Building 5
- Negotiation 5
- Amini, Ali 4
- Rivers 3
- Qanats 2
- Buffer states 1
- Calendars 1
- Dashti Margo (Afghanistan) 1
- Foreign relations 1
- Hari Rud 1
- Measurement 1