"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLG8-P4N : accessed 20 September 2021), Bertha L Abrahm in household of Theoeder Abrahm, Lodema, Pembina, North Dakota, United States; citing enumeration district (ED) ED 142, sheet 13B, family 41, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1145; FHL microfilm 1,375,158.
"North Dakota Census, 1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK9C-3WL4 : 17 March 2018), Bertha Hartje in household of Alfred Hartje, St Thomas, Pembina, North Dakota, United States; citing sheet number 3, family number 24, State Historical Society of North Dakota; FHL microfilm 1,731,402.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XKVZ-12L : accessed 20 September 2021), Bertha M Hartje in household of Alfred W Hartje, Cavalier, Pembina, North Dakota, United States; citing enumeration district (ED) ED 10, sheet 6A, line 35, family 112, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1740; FHL microfilm 2,341,474.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KM9Y-F1V : 5 January 2021), Bertha L Hartje in household of Alfred W Hartje, Farmington Township, Walsh, North Dakota, United States; citing enumeration district (ED) 50-13, sheet 2A, line 12, family 19, 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 3016.
Death
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVPL-YPPP : accessed 20 September 2021), Bertha Hartje in entry for William J Abraham, North Dakota, United States, 12 Oct 1987; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Grand Forks Herald, born-digital text.
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKWC-XDM8 : accessed 20 September 2021), Bertha Hartje, North Dakota, United States, 18 Sep 1994; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Grand Forks Herald, born-digital text.
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKRC-27BX : accessed 20 September 2021), Bertha Abraham Hartje in entry for Harvey Laverne Hartje, North Dakota, United States, 16 Mar 1999; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Grand Forks Herald, born-digital text.
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DNA Connections
It may be possible to confirm family relationships with Bertha 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 Bertha: