Ellen J Hercik

"United States Census, 1920", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MZQX-3WB : 2 February 2021), Ellen Mattson in entry for Matt Mattson, 1920.

"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XSGX-GCH : accessed 6 July 2023), Ellen J Mattson in household of Vincent Redesino, Chicago (Districts 0751-1000), Cook, Illinois, United States; citing enumeration district (ED) ED 942, sheet 14A, line 45, family 205, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 457; FHL microfilm 2,340,192.

"United States Census, 1940", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KW1H-Q23 : Wed Jun 14 12:30:12 UTC 2023), Entry for Joseph Hercik and Ellen Hercik, 1940.

"United States 1950 Census", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6J4H-GDVN : Mon Jan 30 00:28:54 UTC 2023), Entry for Joseph Hercik and Ellen J Hercik, 25 April 1950.