Creator
- Iowa. State Planning Board. Transportation Committee2
- Advocate-Republican1
- Bowman, Alfred B.1
- Brown, C. H.1
- Chariton Basin Planning Board (Iowa)1
- Craig, Donald.1
- Freeman, Homer J.1
- Griffith, W. I.1
- Hawley, F. K.1
- Iowa Geological Survey1
- Iowa State College. Library1
- Iowa State Conservation Commission. Biological Survey Unit1
- 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