"Iowa State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VTQH-JJV : 17 November 2014), Katie O Brien, Pocahontas, Iowa, United States; citing p. 4, 1895, State Historical Society, Des Moines; FHL microfilm 1,022,094.
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XV85-YMW : 20 May 2016), Catherine Elizabeth O Brien in entry for Mary Colleen Harrold, 15 May 1933; citing Lincoln Township, Pocahontas, Iowa, United States; county district courts, Iowa; FHL microfilm 1,398,843.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9L7-C1Q : accessed 17 March 2019), Katy Obrien in household of John Obrien, Bellville Township, Pocahontas, Iowa, United States; citing enumeration district (ED) 160, sheet 4B, family 70, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,452.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGMB-YT5 : accessed 17 March 2019), Kate Obrien in household of John Obrien, Bellville, Pocahontas, Iowa, United States; citing enumeration district (ED) ED 186, sheet 10B, family 121, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 416; FHL microfilm 1,374,429.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJZS-MB9 : 26 September 2017), Frank Harold and Katherine A. O'Brien, 06 Sep 1911, Palmer, Pocahontas, Iowa, United States; citing reference cn 2469, county courthouses, Iowa; FHL microfilm 1,401,834.
Obituary, The Pomeroy Herald, 18-Apr-1968, page 1 [1]
Find A Grave, database and images (https://www.findagrave.com : accessed 17 March 2019), memorial page for Catherine Elizabeth O'Brien Harrold (1890–14 Apr 1968), Find A Grave Memorial no. 89279536, citing Saint Josephs Cemetery, Palmer, Pocahontas County, Iowa, USA ; Maintained by Cindy (contributor 47675215) . [2]
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It may be possible to confirm family relationships with Katie 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 Katie: