Soil survey of Fond du Lac County, Wisconsin
Whitson, Andrew Robeson, 1870-; United States. Bureau of Soils; Geib, W. J. (Warren Jacob), b. 1880; Schoenmann, L. R. (Lee Roy Adolph), b. 1889; Musback, Frederick Ludwig; Conrey, G. W. (Guy Woolard), 1887-; Taylor, Arthur Elijah, 1877-