1. "Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KF2K-JWV : 19 February 2021), Henry Oppeirman and Minna Bierman, 15 Aug 1862; citing Randolph, Illinois, United States, county offices, Illinois; FHL microfilm 975,010.
4. "United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MXKH-TV1 : 13 January 2022), Minnie Opperman in household of Henry Opperman, Wine Hill, Randolph, Illinois, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
5. "Illinois Births and Christenings, 1824-1940", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V2LC-FSL : 11 January 2020), Mina Biermann in entry for Henry George Oppermann, 1880.
6. "Illinois Births and Christenings, 1824-1940", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V2LC-F1X : 11 January 2020), Mina Bierman in entry for Henry Herman Opperman, 1883.
7. "Illinois Births and Christenings, 1824-1940", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V2LC-KJV : 11 January 2020), Maria Biermann in entry for Maria Caraline Dora Oppermann, 1885.
8. "Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KF22-FZM : 19 February 2021), Wilhelmina Bierman in entry for Ludwig Lindner and Christine Sophie Alvina Opperman, 20 Jan 1887; citing Randolph, Illinois, United States, county offices, Illinois; FHL microfilm 975,011.
10. "Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KF22-PJY : 19 February 2021), Wilhelmine Bierman in entry for Harmon Meier and Caroline Opperman, 21 May 1896; citing Randolph, Illinois, United States, county offices, Illinois; FHL microfilm 975,012.
12. "Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KF22-KBT : 19 February 2021), H. Biermann in entry for August L. Fricke and Dora Oppermann, 01 Jun 1899; citing Randolph, Illinois, United States, county offices, Illinois; FHL microfilm 975,012.
15. "Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KF2L-ZX7 : 19 February 2021), Wilhelmina Bierman in entry for Henry Brockmeyer and Mary Oppermann, 31 Jan 1909; citing Randolph, Illinois, United States, county offices, Illinois; FHL microfilm 975,012.
17. "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKXZ-3WL : accessed 23 May 2023), Oppermann, Wine Hill, Randolph, Illinois, United States; citing enumeration district (ED) ED 121, sheet 5A, family 78, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 320; FHL microfilm 1,374,333.
18. "Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3DY-G5P : 8 March 2018), Wilhelmine Opperman, 11 Dec 1925; Public Board of Health, Archives, Springfield; FHL microfilm 1,504,133.
19. "Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NQ5C-3QY : 8 March 2018), Wilhelmine Bierman in entry for Alvine Christine Sophie Lindner, 15 May 1926; Public Board of Health, Archives, Springfield; FHL microfilm 1,613,374.
20. "Illinois Deaths and Stillbirths, 1916-1947", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:N32R-LTM : 25 April 2022), Wilhelmina Bierman in entry for Charles Herman Oppermann, 1933.
21. "Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3GZ-VVJ : 8 March 2018), Wilhelmina Biemann in entry for Lina Meyer, 18 Apr 1937; Public Board of Health, Archives, Springfield; FHL microfilm 1,786,731.
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DNA Connections
It may be possible to confirm family relationships with Wilhelmina by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Wilhelmina: