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- [S1346] Ancestry.com, 1930; Census Place: Decker, Richland County, Illinois, (http://www.ancestry.com), District 4, Page 5a, Roll 554, none. (Reliability: 2).
- [S1347] http://www.findagrave.com, Headstone, McDowell, Ralph A. and Mary Leona, (https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=McDowell&GSiman=1&GScid=105304&GRid=71865681&), none. (Reliability: 2).
- [S1349] http://www.findagrave.com, Obituary, McDowell, Mary L., 70, (https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=70708405), none. (Reliability: 2).
- [S1348] Ancestry.com, 1930 Federal Census, Decker Township, Richland County, Illinois, District 4 (Township), page 5a, (http://www.ancestry.com), District 4, Page 5a, Roll 554, none. (Reliability: 2).
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