"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4LN-6Z1 : accessed 6 May 2016), Robert S Ruhl in household of Monroe N Ludden, Williamston, Williamston Township, Ingham, Michigan, United States; citing enumeration district (ED) 33-90, sheet 2A, family 31, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1763.
Ludden, Wallace, "James Ludden, The Old Planter, 1611-1692 and descendants", 1971. Page 198.
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