Sources |
- [S1656] Ancestry.com, 1930 United States Federal Census, Clay City, Clay County, Illinois, (District 0004) (Township), image 10, page 5b, (https://www.ancestry.com/interactive/6224/4584337_00620?backurl=https%3a%2f%2fsearch.ancestry.com%2fsearch%2fdb.aspx%3fd), none. (Reliability: 2).
- [S224] Ancestry.com, 1920 United States Federal Census, Clay City, Clay County, Illinois, Enumeration District 3, Page 4A, (http://search.ancestry.com/content/viewer.aspx?dbid=6061&iid=4300174_00614&sid=&gskw=) (Reliability: 2).
- [S3273] Ancestry.com, 1920 United States Federal Census, Clay City, Clay County, Illinois, Enumeration District 3, Page 9B, (http://search.ancestry.com/content/viewer.aspx?dbid=6061&iid=4300174_00625&sid=&gskw=) (Reliability: 2).
- [S809] Ancestry.com, 1940 United States Federal Census, Clay City, Illinois, (District 13-4) (Township), image 21, page 11a, (https://www.ancestry.com/interactive/2442/M-T0627-00769-00087?backurl=https%3a%2f%2fsearch.ancestry.com%2fsearch%2fdb.as) (Reliability: 3).
- [S4691] The Daily Clay County Advocate-Press, Flora, Clay County, Illinois, Obituary, Duff, John K, 85, (The Daily Clay County Advocate-Press, Flora, Clay County, Illinois), none. (Reliability: 2).
- [S4690] https://www.findagrave.com, Headstone, Duff, Noma M. and John Wallace, (https://www.findagrave.com/memorial/24068518/john-wallace-duff), none. (Reliability: 2).
- [S338] Ancestry.com, 1940 United States Federal Census, Clay City, Clay County, Illinois, (District 13-3) (Village), image 25, page 12b, (https://www.ancestry.com/interactive/2442/M-T0627-00769-00053?backurl=https%3a%2f%2fsearch.ancestry.com%2fsearch%2fdb.as) (Reliability: 3).
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