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- [S91] Family Tree on Ancestry.com, Thomas Pine Petznick http://trees.ancestry.ca/tree/3310678/person/-1750156719.
- [S883] 1910 U.S. census, Digital images, (National Archives and Records Administration, n.d.).
- [S884] 1920 United States Federal Census, 1920 United States Federal Census, (Ancestry.com. 1920 United States Federal Census [database on-line]. Provo, UT, USA: The Generations Network, Inc., 2005. For details on the contents of the film numbers, visit the following NARA web page: NARA., Note: Enumeration Districts 819-839 on roll 323 (Chicago City. Original data: United States of America, Bureau of the Census. Fourteenth Census of the United States, 1920. Washington, D.C.: National Archives and Records Administration, 1920. T625, 2,076 rolls.).
- [S919] Ancestry.com, 1930 United States Federal Census, (Name: The Generations Network, Inc.; Location: Provo, UT, USA; Date:2002;).
- [S920] Ancestry.com. 1940 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2012., Original data: United States of America, Bureau of the Census. Sixteenth Census of the United States, 1940. Washington, D.C.: National Archives and Records Administration, 1940. T627, 4,643 rolls.
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