"Pennsylvania, County Marriages, 1885-1950", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VFQJ-7LT : 24 June 2016), Joseph John Oestreicher in entry for Joseph John Oestreicher and Elizabeth Mary O'Connor, 1939.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQWX-C24 : accessed 12 March 2017), Joseph Oestreicher, Ward 21, Pittsburgh, Pittsburgh City, Allegheny, Pennsylvania, United States; citing enumeration district (ED) 69-619, sheet 8B, line 73, family 157, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3671.
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