1929. United States. Bureau of Chemistry and Soils. Base map in part from U.S. Geological Survey sheets. 83 x 78 Centimeters Scale 1:62,500 Minnesota County Maps, Plat Books, and Atlases. Field Operations, Bureau of Chemistry and Soils (Washington, D.C.?).
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1929. United States. Bureau of Chemistry and Soils. 63 x 67 Centimeters Scale [1:63,360] Minnesota County Maps, Plat Books, and Atlases. Field Operations, Bureau of Chemistry and Soils (Washington, D.C.?).
1923. United States. Bureau of Chemistry and Soils. 63 x 78 centimeters Scale [1:63,360] Minnesota County Maps, Plat Books, and Atlases. Field Operations, Bureau of Soils (Washington, D.C.?).
1916. United States. Bureau of Chemistry and Soils and University of Minnesota. Agricultural Experiment Station. Cartographic Details: Scale approximately 1:49,000. Not "1 in. = 1 mi." (W 93°30 ª--W 93°00 ª/N 45°25 ª--N 45°00 ª). Enlarged reproduction. "Soils ... Snyder & Black (New York).
1926. United States. Bureau of Chemistry and Soils. Base map in part from International Joint Commission charts. 93 x 56 Centimeters Scale [1:126,720] Minnesota County Maps, Plat Books, and Atlases. Field Operations, Bureau of Soils (Washington, D.C.?).