"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XM2H-1H5 : accessed 11 September 2017), Ralph L Simmons, Washington, Washington, District of Columbia, United States; citing enumeration district (ED) ED 386, sheet 3A, line 6, family 89, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 304; FHL microfilm 2,340,039.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7F6-L8W : accessed 11 September 2017), Ralph Simmond, Sanitary District, Election District 7, Montgomery, Maryland, United States; citing enumeration district (ED) 16-19, sheet 15A, line 26, family 329, 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 1554.
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