"Maine Vital Records, 1670-1921", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q24N-6R26 : 6 October 2016), Daniel Leslie Ludden in entry for Ruth Luella Ludden, 1908.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQPQ-1JJ : accessed 19 April 2017), Harold L Ludden in household of Dan* D Ludden, Groton, Middlesex, Massachusetts, United States; citing enumeration district (ED) ED 248, sheet 14A, line 10, family 27, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 920; FHL microfilm 2,340,654.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4FX-ZZR : accessed 19 April 2017), Harold L Ludden in household of Etta E Ludden, Groton Town, Middlesex, Massachusetts, United States; citing enumeration district (ED) 9-180, sheet 3A, line 22, family 48, 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 1607.
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