"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MW3H-SV8 : accessed 9 January 2015), Hendrik Kas, Zeeland, Ottawa, Michigan, United States; citing enumeration district 246, sheet 532C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0601; FHL microfilm 1,254,601.