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Creator
- United States. Soil Conservation Service35
- Owen, Andrew14
- Murphy, Brendan12
- Illinois State Geological Survey4
- Levinson, David M4
- Rand McNally and Company2
- United States. Mississippi River Commission2
- Beck, Lewis C. (Lewis Caleb), 1798-18531
- Bement, A. (Alburto), 1862-1
- Illinois Commerce Commission1
- Standard Oil Company (Ind.)1
- United States Coast Survey1
- United States. Bureau of Public Roads1
- United States. General Land Office1