University Archives and Southern Minnesota Historical Center
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Hartle, John Agar, 1892 - 1979. Papers, 1945 - 1977. SMHC Collection 1287, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato.
Hartle, John Agar, 1892 - 1979. Papers, 1945 - 1977. SMHC Collection 1287, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato. https://archivesspace.lib.mnsu.edu/public/repositories/4/resources/642 Accessed November 01, 2026.