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Creator
- Sanborn Map Company153
- Geological Survey (U.S.)13
- University of Iowa9
- Rand McNally and Company6
- United States. General Land Office5
- Minneapolis (Minn.). City Engineers Office4
- Cram, George Franklin, 1841-19283
- Iowa Publishing Co.3
- Minneapolis, St. Paul & Sault Ste. Marie Railway Company3
- University of Chicago Library3
- American Geographical Society of New York2
- Iowa State College. Department of Civil Engineering2
- Kirk, Fred W.2
- Mills, Marguerite2
- Poole Brothers2
- Rinker, Andrew2
- A. Hoen & Co.1
- American Baptist Mission Press1
- Argentina. Dirección de Economía Rural y Estadística1
- Bauman, Wm. (William)1