1913. Gilbert, B. D., Kirk, N. M., Smith, William G. (Surveyor), Snyder & Black Lithogrs., United States. Bureau of Chemistry and Soils, and Westover, Harvey Leroy. Cartographic Details: Scale [1:63,360]. 1 in. = 1 mile (W 93°03'--W 92°15'/N 44°45'--N 44°10'). In lower right margin: Field operations, Bureau of ...
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1920. United States. Bureau of Chemistry and Soils. Shows soil types by colors and symbols. 34 x 27 centimeters Scale approximately 1:380,160. 1 inch= 6 miles General Map Collection. U.S. Bureau of Soils (Washington, D.C.).
1924. United States. Bureau of Chemistry and Soils. 500 Hemispherical map centered on the South Pole to the Tropic of Capricorn; includes southern parts of South America and South Africa and the west... Field Operations, Bureau of Soils (Washington, D.C.?).