↑ "United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDKS-F48 : accessed 20 Feb 2014), Wm B Gusler, Iowa, United States; citing p. , family 40, NARA microfilm publication M593, FHL microfilm 000545923.
↑ "United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDLG-22L : accessed 20 Feb 2014), W. B. Gusler in household of I. L. Corpman, Dutch Creek, Washington, Iowa, United States; citing sheet 172C, family 4, NARA microfilm publication T9-0369
Personal communication from Mary Boardman Hanke, 20 Feb 2014.
"Iowa, Deaths and Burials, 1850-1990," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XVQN-Q5S : accessed 26 Nov 2014), Wm. B. Gussler, 11 Mar 1888; citing Washington, Ia., reference cn 74; FHL microfilm 969342.
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