- Iowa. State Planning Board. Committee on Transportation4
- Iowa. State Planning Board. Committee on Water Flow & Supply & Stream Pollution4
- Johnson, A. J. (Alvin Jewett), 1827-1884.4
- Kenyon Printing & Mfg Co.4
- Thomas, Cowperthwait & Co.4
- United States. Bureau of Public Roads.4
- Allen, C. R., active 1878-1908.3
- Andreas, A. T. (Alfred Theodore), 1839-19003
- Bradford, T. G. (Thomas Gamaliel), 1802-1887.3
- Gamble, W. H. (William H.)3
- Geological Survey (U.S.)3
- Iowa Geological Survey3
- Iowa Publishing Co.3
- Iowa. Board of Railroad Commissioners.3
- Iowa. State Planning Board. Recreation & Historic Division3
- United States. General Land Office.3
- Asher & Adams.2
- Balliet & Volk2
- Bowen, Howard R. (Howard Rothmann), 1908-19892
- G.W. & C.B. Colton & Co.2