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Creator
- W.W. Hixson & Co.199
- Iowa. State Planning Board25
- Iowa. State Planning Board. Committee on Land Utilization16
- Sanborn Map Company12
- University of Iowa11
- Geological Survey (U.S.)8
- Iowa. State Planning Board. Water Resources Committee7
- Iowa. State Planning Board. Committee on Population Social Trends6
- Iowa. Department of Transportation.5
- Iowa. State Planning Board. Committee on Land Purchase & Mortgage5
- Iowa. State Planning Board. Committee on Population and Social Trends5
- Iowa. State Planning Board. Committee on Transportation4
- Iowa. State Planning Board. Committee on Water Flow & Supply & Stream Pollution4
- Iowa. State Planning Board. Committee on Population & Social Trends3
- Iowa. State Planning Board. Recreation & Historic Division3
- United States. Bureau of Public Roads.3
- University of Chicago Library3
- Bowen, Howard R. (Howard Rothmann), 1908-19892
- Iowa. State Planning Board. Business Research Committee2
- Iowa. State Planning Board. Committee on Business and Industry2