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Creator
- Huebinger, M. (Melchior)139
- W.W. Hixson & Co.93
- University of Iowa87
- Iowa. Department of Transportation.34
- University of Iowa. Libraries. Map Collection31
- Iowa. State Planning Board28
- Warner & Foote27
- Iowa. State Planning Board. Committee on Land Utilization18
- Rand McNally and Company.9
- Iowa. State Planning Board. Water Resources Committee7
- Iowa. State Planning Board. Committee on Land Purchase & Mortgage6
- Iowa. State Planning Board. Committee on Population Social Trends6
- Conrad, J.5
- Geo. A. Ogle & Company5
- Iowa. State Planning Board. Committee on Population and Social Trends5
- J.H. Colton & Co.5
- Mitchell, S. Augustus (Samuel Augustus), 1792-1868.5
- State Historical Society of Iowa (Iowa City)5
- Anderson Publishing Company4
- Iowa. State Planning Board. Committee on Population & Social Trends4