"John Holmstrom." Family Search. Accessed March 25, 2017. https://familysearch.org/tree/person/L7XT-K3B/.
"South Dakota, Department of Health, Index to Births 1843-1914 and Marriages 1950-2014," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QKDD-9P8K : 2 September 2015), John Holmstrom in entry for Gustav Holmstrom, 24 Jan 1907; citing Birth, Mccook, South Dakota, United States, South Dakota Department of Health, Pierre; FHL microfilm .
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