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Creator
- Farmer (Saint Paul, Minn.)21
- G.M. Hopkins & Co.2
- Geological Survey (U.S.)1
- Graves, Henry Solon, 1871-19511
- Henderson, Albert1
- National Highways Association1
- Shedd-Brown Manufacturing Company (Minneapolis, Minn.)1
- United States. Bureau of Chemistry and Soils1
- United States. Forest Service1
- United States. Office of Indian Affairs1
- University of Minnesota. Agricultural Experiment Station1