"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4L1-MTR : accessed 10 August 2017), Henry Geldersma in household of Jacob Geldersma, Alto, Bowne Township, Kent, Michigan, United States; citing enumeration district (ED) 41-4, sheet 12B, line 54, family 267, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1774.
"Michigan Obituaries, 1820-2006," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVJ1-ZPHN : accessed 10 August 2017), Henry Charles Geldersma, 1991; citing , , Michigan, United States, various offices and archives, Michigan.
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