| Sources |
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Rockvale, Fremont, Colorado; Roll: T625_164; Page: 12A; Enumeration District: 70.
- [S7090] Colorado, U.S., County Marriage Records and State Index, 1862-2006.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Lincoln Park, Fremont, Colorado; Page: 5B; Enumeration District: 0023; FHL microfilm: 2339976.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: Lincoln Park, Fremont, Colorado; Roll: m-t0627-00463; Page: 7A; Enumeration District: 22-25.
- [S9100] U.S., Social Security Death Index, 1935-2014, Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File.
- [S9078] U.S., Social Security Applications and Claims Index, 1936-2007.
- [S9072] U.S., Find a Grave® Index, 1600s-Current.
- [S99] Colorado, U.S., Steelworks Employment Records, 1887-1979, Steelworks Center of the West; Pueblo, CO.
- [S9389] 1910 United States Federal Census, Year: 1910; Census Place: Rockvale, Fremont, Colorado; Roll: T624_119; Page: 6A; Enumeration District: 0079; FHL microfilm: 1374132.
- [S195] Newspapers.com Obituary Index, 1800s-current, Colorado Springs Gazette-Telegraph; Publication Date: 27/ Aug/ 1975; Publication Place: Colorado Springs, Colorado, United States of America; URL: https://www.newspapers.com/image/64184611/?article=5e6849b7-7d90-401d-88bf-3ede406f4b97&focus=0.7474546,0.32.
Colorado Springs Gazette-Telegraph; Publication Date: 27/ Aug/ 1975; Publication Place: Colorado Springs, Colorado, United States of America; URL: https://www.newspapers.com/image/64184611/?article=5e6849b7-7d90-401d-88bf-3ede406f4b97&focus=0.7474546,0.32
- [S225] Majdan Królewski Parish Records, 1890-1894 (Majdan Królewski), Majdan year 1890, act 4; Jan Sudoł and Anna Kozioł marriage.
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