Creator
- Iowa State College. Department of Civil Engineering1
- Iowa State College. Library1
- Iowa State Conservation Commission. Biological Survey Unit1
- Iowa State University. Library1
- Iowa. Fish and Game Commission1
- Iowa. State Planning Board. Biological Survey1
- Iowa. State Planning Board. Biological Survey Unit1
- Iowa. State Planning Board. Committee on Health1
- Iowa. State Planning Board. Committee on Industry1
- Iowa. State Planning Board. Committee on Land Purchase Mortgage1
- Iowa. State Planning Board. Committee on Public Education1
- Iowa. State Planning Board. Committee on Rural, Secondary, & Adult Education1
- Iowa. State Planning Board. Committee on Soil Conservation1
- Iowa. State Planning Board. Committee on Soils Survey1
- Iowa. State Planning Board. Committee on Surveys, Maps, & Plans1
- Iowa. State Planning Board. Committee on Urban Land Use and Traffic Studies1
- Iowa. State Planning Board. Committee on business and industry1
- Iowa. State Planning Board. Committee on soil conservation1
- Iowa. State Planning Board. Farm Tenancy Committee1
- Iowa. State Planning Board. Health and Housing Committee1