Waller-Joos-Stetzler
"United States Census, 1940", index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWCR-XF8 : accessed 11 Mar 2014), Robert K Joos in entry for Emil J Joos, 1940.
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Title "United States Census, 1940", index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KWCR-XF8 : accessed 11 Mar 2014), Robert K Joos in entry for Emil J Joos, 1940. Short Title Robert K Joos in household of Emil J Joos, "United States Census, 1940" Source ID S482 Linked to (1) Joos, Robert Kenneth