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Publisher
- Sanborn Map Company1,007
- Sanborn-Perris Map Co.613
- Geological Survey (U.S.)273
- Geological Survey Division (Urbana, Ill.)222
- Sanborn Map & Publishing Co.162
- Dept. of Agriculture, Soil Conservation Service (Washington.)22
- USDA-SCS (Fort Worth, Tex.)13
- State Geological Survey (Urbana, Ill.)9
- Bureau of Geology and Mines (Rolla, Mo.)6
- Kentucky Geological Survey (Lexington, Ky.)5
- U.S. Geological Survey (U.S.)4
- War Dept., Corps of Engineers, U.S. Army (U.S.)4
- Geological Survey Division (Urbana, Ill)3
- Geological and Natural History Survey (Madison, Wis.)3
- The Survey (Urbana, Ill)3
- U.S. Geological Survey (Washington, D.C.)3
- Central Map, Survey and Publishing Co.2
- Illinois State Geological Survey2
- Mississippi River Commission2
- S. Augustus Mitchell (Philadelphia)2