Sources |
- [S6391] https://www.findagrave.com, Headstone, Duff, Mary E., (https://www.findagrave.com/memorial/24071223/mary-elizabeth-duff) (Reliability: 2).
- [S674] Ancestry.com, 1930 United States Federal Census, Clay City, Illinois, (District 0003) (Village), image 04, page 2b, (https://www.ancestry.com/interactive/6224/4584337_00604?backurl=https%3a%2f%2fsearch.ancestry.com%2fsearch%2fdb.aspx%3fd), none. (Reliability: 2).
- [S42] Ancestry.com, 1920 United States Federal Census, Clay City, Clay County, Illinois, Enumeration District 3, Page 10A, (http://search.ancestry.com/content/viewer.aspx?dbid=6061&iid=4300174_00626&sid=&gskw=) (Reliability: 2).
- [S14479] http://www.findagrave.com, Obituary, Duff, Richard F., (http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSsr=681&GScid=105163&GRid=24071213&CScn=Clay+City&CScntry=4&CSst=16&), none. (Reliability: 2).
|