"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MD22-Y2H : accessed 28 Nov 2014), William Franzen, Fairfield, Jackson, Iowa, United States, 320; citing sheet 509A, film number 0346, NARA microfilm publication T9, National Archives and Records Administration, Washington D.C.; FHL microfilm 1254346.
"Iowa State Census, 1895," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VT38-8GL : accessed 28 Nov 2014), William Franzen, Jackson, Iowa, United States; citing p. 175, 1895, State Historical Society, Des Moines; FHL microfilm 1020365.
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/ML1J-6ST : accessed 28 Nov 2014), William Franzen in household of Henry Franzen, Waterford, Clinton, Iowa, United States; citing enumeration district (ED) 35, sheet 10B, family 199, NARA microfilm publication T624, National Archives and Records Administration, Washington, D.C.; FHL microfilm 1374411.
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