Huang, Ting-Ting; Carlson, Elaine J.; Melov, Simon; Ursell, Philip C.; Olson, Jean L.; Noble, Linda J.; Yoshimura, Midori P. et al. (1995年12月). “Dilated
Doctrinaire Democrat (1954) Democratic leader in 1880s and 1890s Frederick I. Olson, Milwaukee: At the Gathering of the Waters A History of Agriculture in Wisconsin