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Publisher
- United States. Agricultural Stabilization and Conservation Service36
- United States. Department of Agriculture36
- United States. Department of Agriculture. Production and Marketing Administration16
- University of Iowa14
- Geological Survey (U.S.)2
- Geological Survey Division (Urbana, Ill.)2
- H.M Goushá1
- The Administration1
- The Office1
- Waterloo Planning and Zoning Commission1