"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XCS4-3N4 : accessed 18 February 2015), Elvira J Guffey in household of Charles Guffey, Portland (Districts 271-553), Multnomah, Oregon, United States; citing enumeration district (ED) 0470, sheet 1A, family 4, line 24, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1953; FHL microfilm 2,341,687.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VRTY-3ZB : accessed 16 December 2017), Elvera Guffey in household of Charley Guffey, Tract 23, Portland, Portland City Election Precinct 286, Multnomah, Oregon, United States; citing enumeration district (ED) 37-383, sheet 6A, line 14, family 131, 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 3391.
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