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- [S4] Brzostowa Góra Births, 1833-1893 (Majdan Królewski), year 1875, act 22; Jan Sudoł birth and baptism.
- [S16] New York, U.S., Passenger and Crew Lists (including Castle Garden and Ellis Island), 1820-1957, Year: 1901; Arrival: New York, New York, USA; Microfilm Serial: T715, 1897-1957; Line: 21; Page Number: 173.
- [S9072] U.S., Find a Grave® Index, 1600s-Current.
- [S9318] 1930 United States Federal Census, Year: 1930; Census Place: Greenwich, Fairfield, Connecticut; Page: 3A; Enumeration District: 0136; FHL microfilm: 2339992.
- [S9282] 1940 United States Federal Census, Year: 1940; Census Place: Greenwich, Fairfield, Connecticut; Roll: m-t0627-00496; Page: 61B; Enumeration District: 1-67.
- [S9305] Connecticut, U.S., Death Index, 1917-2017.
- [S9322] 1920 United States Federal Census, Year: 1920; Census Place: Greenwich, Fairfield, Connecticut; Roll: T625_177; Page: 4B; Enumeration District: 118.
- [S185] Connecticut, U.S., Death Records, 1897-1968, State Vital Records Office; Hartford, Connecticut; Connecticut Vital Records — Index of Deaths, 1897-1968.
- [S9308] U.S., City Directories, 1822-1995.
- [S5] Brzostowa Góra Marriages, 1866-1922 (Majdan Królewski), year 1869, act 1; Mikołaj Sudoł and Katarzyna Zięba marriage.
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