United States Census, 1940," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KH3W-XJC : accessed 21 May 2015), Peter Vanderson in household of Harold David Derugter, Ward 3, Grand Rapids, Grand Rapids City, Kent, Michigan, United States; citing enumeration district (ED) 86-134, sheet 3A, family 42, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1901.