"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCJD-43F : accessed 4 June 2015), Helen A Jenness in household of George B Jenness, Cottonwood, Yolo, California, United States; citing enumeration district (ED) 0006, sheet 2A, family 31, line 31, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 225; FHL microfilm 2,339,960.
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