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- Sanborn Map Company71
- Geological Survey (U.S.)10
- Canada. Topographical Survey4
- Lobeck, A. K. (Armin Kohl), 1886-19583
- McGill-Warner Co.3
- Rand McNally and Company3
- Iowa. Highway Commission2
- Mulford, John C2
- Sveriges geologiska undersökning2
- United States. Bureau of Chemistry and Soils2
- United States. General Land Office2
- University of Chicago. Department of Sociology2
- Automobile Club of Saint Paul1
- Berthrong, I. P.1
- Bond, Frank, 1856-19401
- Briesemeister, William A.1
- C.S. Hammond & Company1
- Columbus (Ohio). City Planning Commission1
- Darton, Nelson Horatio, 1865-19481
- Disturnell, John, 1801-18771