Petterson, Gustav S., 1889-1965, and Family. Collection, 1916-1979. SMHC Collection 0245, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato.

Petterson, Gustav S., 1889-1965, and Family. Collection, 1916-1979. SMHC Collection 0245, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato. https://archivesspace.lib.mnsu.edu/public/repositories/4/resources/122 Accessed April 19, 2025.