Bertha G. Bradt Collection (DeKalb), RHC-RC-046, supplemental_material: .pdf; Volume: 1. Northern Illinois University.
Bertha G. Bradt Collection (DeKalb), RHC-RC-046, supplemental_material: .pdf; Volume: 1. Northern Illinois University. http://archives.lib.niu.edu/repositories/2/resources/1175 Accessed December 22, 2024.
