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- Great Britain 3
- Mexico 3
- Oregon State University. Agricultural Experiment Station 3
- United States 3
- United States. Bonneville Power Administration 3
- United States. Department of the Interior 3
- Chile 1
- Doerksen, Harvey R. 1
- France 1
- Italy 1
- Jind (Princely State) 1
- Kazakhstan 1
- Klamath County Chamber of Commerce 1
- Kyrgyzstan 1
- Nabha (Princely State) 1
- Patiāla (Princely State) 1
- Peru 1
- Tajikistan 1
- Turkmenistan 1
- Uzbekistan 1