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- Iowa. State Planning Board101
- United States. Agricultural Stabilization and Conservation Service94
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- W.W. Hixson & Co.93
- University of Iowa11
- The Bureau3
- Kean Map Co.2
- Advocate-Republican1
- Bureau of Public Roads1
- Iowa City Branch of the American Association of University Women1
- Iowa Geological Survey1
- Iowa State College Library1
- Iowa. State Planning Board. Committee on Industry1
- Iowa. State Planning Board. Committee on Population and Social Trends1
- Iowa. State Planning Board. Committee on Soil Conservation1
- Iowa. State Planning Board. Health and Housing Committee1
- Kenyon Company (Des Moines, Iowa)1
- State Historical Society of Iowa1
- U.S. Geological Survey1