Wirtz and Wirtz Company Records (DeKalb), RHC-RC-060, Volume: 1-7. Northern Illinois University.
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Wirtz and Wirtz Company Records (DeKalb), RHC-RC-060, Volume: 1-7. Northern Illinois University. http://archives.lib.niu.edu/repositories/2/resources/1219 Accessed December 22, 2024.