"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MWSK-Q6P : accessed 2 February 2015), Trentij Vander Velde in household of Dirk Vander Velde, Grand Rapids, Kent, Michigan, United States; citing enumeration district 139, sheet 325D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0588; FHL microfilm 1,254,588.