Creator
- Gray, Ormando Willis1
- Griffith, W. I.1
- H.M. Gousha Company.1
- Hammond, W. G.1
- Harrison & Warner.1
- Hawley, F. K.1
- Henn, Williams and Co.1
- Iowa City (Iowa). City Engineer's Office.1
- Iowa Engineering Co.1
- Iowa State College. Library1
- Iowa State Conservation Commission. Biological Survey Unit1
- Iowa State University. Library1
- Iowa. Fish and Game Commission1
- Iowa. Highway 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