"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/ML5Y-CWM : accessed 17 January 2015), Jacob Rowhorst in household of Martha Veyer, Grand Rapids Ward 6, Kent, Michigan, United States; citing enumeration district (ED) 82, sheet 6B, family 103, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,670.