Wisconsin State Highway Commission (November 1914). Main Traveled Routes in Wisconsin (Map). Scale not given. Madison: Wisconsin State Highway Commission. OCLC829855901. Retrieved April 10, 2020 – via Wisconsin Historical Society.
Wisconsin State Highway Commission (1930). Official Highway Map of Wisconsin 1930 (Map). 1:823,680. Madison: Wisconsin State Highway Commission. OCLC429695317. Retrieved April 10, 2020 – via Wisconsin Historical Society.
Wisconsin State Highway Commission (1931). Official Highway Map of Wisconsin 1931 (Map). 1:823,680. Madison: Wisconsin State Highway Commission. Retrieved April 10, 2020 – via Wisconsin Historical Society.
Wisconsin State Highway Commission (1934). Official Highway Map of Wisconsin 1934 (Map). 1:823,680. Madison: Wisconsin State Highway Commission. Retrieved April 10, 2020 – via Wisconsin Historical Society.
Wisconsin State Highway Commission (November 1914). Main Traveled Routes in Wisconsin (Map). Scale not given. Madison: Wisconsin State Highway Commission. OCLC829855901. Retrieved April 10, 2020 – via Wisconsin Historical Society.
Wisconsin State Highway Commission (1930). Official Highway Map of Wisconsin 1930 (Map). 1:823,680. Madison: Wisconsin State Highway Commission. OCLC429695317. Retrieved April 10, 2020 – via Wisconsin Historical Society.