"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MW34-PGG : accessed 17 January 2015), Clara Rowhorst in household of Charles Rowhorst, Olive, Ottawa, Michigan, United States; citing enumeration district 243, sheet 458D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0601; FHL microfilm 1,254,601.
"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MHCD-4Y7 : accessed 17 January 2015), Jacob Rohorst in household of Claria Rohorst, Michigan, United States; citing p. 15, family 125, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,196.