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Water-supply
36
Politics and government
22
Laylin, John G. (John Gallup), 1902-
16
Irrigation
11
Agriculture
5
Dams
5
Treaties
5
Water diversion
5
Amini, Ali
4
Building
4
Canals
3
Negotiation
2
Rivers
2
Foreign relations
1
Tipton, R. J. (Royce J.), 1893-
1