"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQKX-35J : accessed 30 April 2015), Gretchen Swanson in household of Carl A Swanson, Omaha, Douglas, Nebraska, United States; citing enumeration district (ED) 0116, sheet 28B, family 15, line 76, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1278; FHL microfilm 2,341,013.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K99H-N8D : accessed 30 April 2015), Gretchen Swanson in household of Carl A Swanson, Ward 10, Omaha, Omaha City, Douglas, Nebraska, United States; citing enumeration district (ED) 94-169, sheet 62A, family 293, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 2274.
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