"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2LL-Q65 : accessed 9 August 2015), Lubert Groothuis, Stoneham, Chippewa, Minnesota, United States; citing enumeration district (ED) 21, sheet 1A, family 5, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,706.