"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJ3P-J87 : accessed 26 June 2019), Frederick Virkus, Chicago Ward 14, Cook (Chicago), Illinois, United States; citing ED 864, sheet 1B, line 55, family 13, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 324; FHL microfilm 1,820,324.
"New York, New York Passenger and Crew Lists, 1909, 1925-1957," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVPZ-5J8D : 15 March 2018), Frederick A Virkus, 1950; citing Immigration, New York, New York, United States, NARA microfilm publication T715 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Illinois, Cook County Birth Registers, 1871-1915," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N7QY-FLX : 10 March 2018), Frederick A. Virkus in entry for George Frederick Virkus, 29 Jan 1903; citing v 47 p 348, Chicago, Cook, Illinois, Cook County Courthouse, Chicago; FHL microfilm 1,287,750.
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