"Iowa, County Marriages, 1838-1934", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJZ3-W9Z : 8 March 2016), Charly E. Strong and Mary E. Elbert, 1905.
"Iowa Deaths and Burials, 1850-1990," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XV78-Y58 : 12 December 2014), J. H. Elberts in entry for Mary E. Strong, 04 Apr 1914; citing Washington, Havelock, reference p7 rn79; FHL microfilm 1,401,841.
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