• 11 Agriculture
• 6 Economic aspects
• 3 Iowa State University. Center for Agricultural and Rural Development
• 2 Agriculture and state
• 2 Rural development
• 1 Agricultural extension work
• 1 Iowa State University. Center for Agricultural and Economic Adjustment
• 1 Iowa State University. Center for Agricultural and Economic Development

• 3 Iowa Agriculture and Home Economics Experiment Station
• 3 Iowa State University. Center for Agricultural and Rural Development
• 2 Iowa State College. Agricultural Experiment Station
• 1 Iowa Corn Research Institute
• 1 Iowa State College
• 1 Iowa State College. Agricultural Extension Service
• 1 Iowa State College. Agricultural and Home Economics Experiment Station
• 1 Iowa State University. Center for Agricultural and Economic Adjustment
• 1 Iowa State University. Center for Agricultural and Economic Development
• 1 Iowa State University. Cooperative Extension Service

• 11 English

• 5 Ames
• 2 United States
• 1 Middle West

• 9 Periodicals

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