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- [S522] Illinois. Chicago., Chicago Tribune, Zitko, p. 24, col. 8; digital images, \i Newspapers.com by Ancestry\i0 (newspapers.com : accessed 23 Jan 2024), Online Newspaper Archive. (Reliability: 3).
- [S497] Henrietta Novy, Severin Families 1776 - 2000, (N.p.: Henrietta Severin Novy, 2000.), Tab: John Zitko and Mary Severin. (Reliability: 2).
- [S514] Social Security Administration, "Social Security Applications and Claims, 1936-2007," database, ( Ancesry.com (Ancesry.com/search/collections/60901/ : 27 May 2020)), entry for Rudolph Ignatius Zitko, 1912, SS no. 325101569, accessed 25 Jan 2024 (Reliability: 4).
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