Minnesota Territorial Centennial Stamp Covers, 1949. SMHC Manuscript Collection 1306, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato.

Minnesota Territorial Centennial Stamp Covers, 1949. SMHC Manuscript Collection 1306, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato. https://archivesspace.lib.mnsu.edu/public/repositories/4/resources/174 Accessed October 18, 2024.