Hagen, Hal E., 1922-2002. Oral History Interview, 21 November 1989. SMHC Manuscript Collection 1394, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato.

Hagen, Hal E., 1922-2002. Oral History Interview, 21 November 1989. SMHC Manuscript Collection 1394, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato. https://archivesspace.lib.mnsu.edu/public/repositories/4/resources/448 Accessed April 25, 2024.