"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHCD-66F : accessed 29 August 2015), Loentze Van Der Berg in household of Hubreckt Van Der Berg, Michigan, United States; citing p. 24, family 203, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,196.