"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFBN-52F : accessed 26 March 2015), Helen L Cox in household of John S Cox, Johnstown Ward 20, Cambria, Pennsylvania, United States; citing sheet 17B, family 345, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,547.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XH82-FT7 : accessed 26 March 2015), Helen Cox in household of John Cox, Johnstown, Cambria, Pennsylvania, United States; citing enumeration district (ED) 0082, sheet 45A, family 903, line 46, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2012; FHL microfilm 2,341,746.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KQXB-5NG : accessed 26 March 2015), Helen Louise Cox in household of John Cox, Ward 20, Johnstown, Johnstown City, Cambria, Pennsylvania, United States; citing enumeration district (ED) 11-112, sheet 10A, family 164, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 3455.
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DNA Connections
It may be possible to confirm family relationships with Helen by comparing test results with other carriers of her ancestors' 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 Helen: