Duncan, Helen M., 1926-2014. Oral History Interview, 31 October and 7 November 1989. SMHC Manuscript Collection 1393, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato.

Duncan, Helen M., 1926-2014. Oral History Interview, 31 October and 7 November 1989. SMHC Manuscript Collection 1393, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato. https://archivesspace.lib.mnsu.edu/public/repositories/4/resources/444 Accessed April 19, 2024.