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- [S288] St. Hedwig's Church Records, Milwaukee, Nov 1892, Frank Pialkowski & Kataryna Lindner.
- [S361] Obituary, Milwaukee Journal, Catharine Piatkowski, Obituary; 2 February 1939.
- [S173] 1920 US Census, Ward 13, Milwaukee, Milwaukee Co., Wisconsin; 154; Sheet 2A; h.15 f.28; Frank Piatkowski; 4 October 2011.
- [S174] 1900 US Census, Ward 13, Milwaukee, Milwaukee, Wisconsin; ED 113; Sheet 17; h.215 f.311; Frank Piontkowski; 3 November 2016.
- [S181] 1910 US Census, Ward 13, Milwaukee, Milwaukee, Wisconsin; ED 135; Sheet 13A; h.125 f.210; Frank Piatkowski; 3 November 2016.
- [S189] 1930 US Census, Ward 21, Milwaukee, Milwaukee, Wisconsin; 40-218; Sheet 10B; Frank Piontkowski; 27 July 2018.
- [S425] St. Casimir's (Milwaukee) Church Records, Digital Images, v.10 Marriages 1908-1920; 21 May 1919; Alexandreum Hauke & Agnes Piontkowska.
- [S251] Wisconsin Marriages, 1836-1930, Source Film 1292299; Project I00649-3; Catharina Lindner & Frank Piatkowski; 1892.
- [S177] Headstone - Holy Cross, Franciszek Piatkowski; Section 18B.
- [S343] Find-A-Grave Entry (Old), 27 July 2018; Frank Piatkowski; #78475744.
- [S174] 1900 US Census, Ward 13, Milwaukee, Milwaukee, Wisconsin; ED 113; Sheet 17; h.215 f.311; Katharina Piontkowski; 3 November 2016.
- [S189] 1930 US Census, Ward 21, Milwaukee, Milwaukee, Wisconsin; 40-218; Sheet 10B; Katherine Piontkowski; 27 July 2018.
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