Severson, Elmer, Alvin Lewis, Elvina Lewis, Sonja Swanson, and Carlyn Severson. Oral History Interview, 1976. SMHC Collection 1210. Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato.

Severson, Elmer, Alvin Lewis, Elvina Lewis, Sonja Swanson, and Carlyn Severson. Oral History Interview, 1976. SMHC Collection 1210. Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato. https://archivesspace.lib.mnsu.edu/public/repositories/4/resources/412 Accessed April 19, 2025.