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Publisher
- United States. Agricultural Stabilization and Conservation Service4
- Lewis W. Vale2
- Harrison & Warner1
- Iowa Map Company1
- Iowa Publishing Co.1
- United States. Commodity Stabilization Service1
- United States. Department of Agriculture1
- United States. Department of Agriculture. Production and Marketing Administration1
- United States. Soil Conservation Service1
- W.W. Hixson & Co.1