| Sources |
- [S16] New York, U.S., Passenger and Crew Lists (including Castle Garden and Ellis Island), 1820-1957, Year: 1913; Arrival: New York, New York, USA; Microfilm Serial: T715, 1897-1957; Line: 7; Page Number: 103.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Derby Ward 1, New Haven, Connecticut; Roll: T625_189; Page: 18A; Enumeration District: 254.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: Derby, New Haven, Connecticut; Roll: m-t0627-00515; Page: 13A; Enumeration District: 5-38.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Derby, New Haven, Connecticut; Page: 8A; Enumeration District: 0124; FHL microfilm: 2340007.
- [S9305] Connecticut, U.S., Death Index, 1917-2017.
- [S246] Huta Komorowska Births, 1837-1890 (Majdan Królewski), year 1880, act 14; Marianna Kopeć birth and baptism.
- [S227] Majdan Królewski Parish Records, 1906-1910 (Majdan Królewski), Dęba year 1909, act 5; Jan Tomczyk and Marianna Kopeć marriage.
- [S7669] Dęba & Poręby Dębskie Marriages, 1901-1941 (Majdan Królewski), year 1903, act 2; Józef Kozdęba and Marianna Kopeć marriage.
- [S185] Connecticut, U.S., Death Records, 1897-1968, State Vital Records Office; Hartford, Connecticut; Connecticut Vital Records — Index of Deaths, 1897-1968.
- [S247] Huta Komorowska Marriages, 1856-1915 (Majdan Królewski), year 1879, act 1; Tomasz Kopeć and Katarzyna Hałka marriage.
- [S1894] Dęba & Poręby Dębskie Marriages & Deaths, 1899-1927 (Majdan Królewski), year 1900, act 9; Agata Kozdęba death and burial.
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