- Dodd, Mead & Company1
- Easley, Frank.1
- Evinger, Morris I.1
- Freeman, Homer J.1
- Gillis, J. R.1
- Gray, Frank A.1
- 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. Department of Civil Engineering1
- Iowa State College. Library1
- Iowa State Conservation Commission. Biological Survey Unit1
- Iowa State University. Library1
- Iowa. Fish and Game Commission1