"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M81D-PG4 : accessed 5 June 2015), Hattie Groen in household of Diedrich Groen, Midland, Lyon, Iowa, United States; citing sheet 2A, family 18, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,497.
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