"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M53X-PKW : accessed 3 April 2022), Hellen Jetter in household of Martin Jetter, Manhattan Ward 12, New York, New York, United States; citing enumeration district (ED) ED 365, sheet 2B, family 42, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1016; FHL microfilm 1,375,029.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:244C-TFV : 10 February 2018), Albert Herdtfelder and Helen Yetter, 13 Oct 1920; citing Marriage, Bronx, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,954,225.
"New York, New York Passenger and Crew Lists, 1909, 1925-1957," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:24XS-8S7 : 2 March 2021), Helen Herdtfelder, 1928; citing Immigration, New York, New York, United States, NARA microfilm publication T715 (Washington, D.C.: National Archives and Records Administration, n.d.).
"New York State Census, 1925," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSM2-Q6V : 8 November 2014), Helen Herdtfelder, New York, A.D. 03, E.D. 05, Bronx, New York, United States; records extracted by Ancestry and images digitized by FamilySearch; citing p. 21, line 30, New York State Archives, Albany.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X4GQ-16D : accessed 3 April 2022), Helen Herdtfelder in household of Albert Herdtfelder, Eastchester, Westchester, New York, United States; citing enumeration district (ED) ED 127, sheet 3A, line 27, family 62, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1659; FHL microfilm 2,341,393.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KQBN-HTZ : 7 January 2021), Helen Herdtfelder in household of Albert Herdtfelder, The Bronx, New York City, New York, United States; citing enumeration district (ED) 3-26, sheet 10B, line 70, family 241, 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 2460.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JYMS-5ZX : 7 January 2021), Helen Herdtfelder, Aug 1974; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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DNA Connections
It may be possible to confirm family relationships with Helena 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 Helena: