"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/V1TD-TKK : accessed 31 December 2017), Mary J Mckain in household of Ralph Mckain, Cortland, Hamilton Township, Jackson, Indiana, United States; citing enumeration district (ED) 36-8, sheet 2A, line 27, family 35, 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 1056.
"Indiana Marriages, 1780-1992," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XFXB-2H3 : 3 December 2014), Ralph Orris Mckain and Mary Jane Sunderland, 31 Oct 1930; citing reference p 122; FHL microfilm 1,940,240.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X41R-NRL : accessed 31 December 2017), Mary Sunderland in household of John A Sunderland, Center, Boone, Indiana, United States; citing enumeration district (ED) ED 5, sheet 6B, line 63, family 144, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 578; FHL microfilm 2,340,313.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFQV-F3R : accessed 31 December 2017), Mary Sunderland in household of John Sunderland, Lebanon Ward 4, Boone, Indiana, United States; citing ED 7, sheet 10A, line 3, family 249, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 423; FHL microfilm 1,820,423.
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