"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9GY-6GN : accessed 22 August 2015), Walter Ross Ralph in household of Walter Ralph, Township 5, Mountain House, Soulsbyville, and Summerville Precincts, Tuolumne, California, United States; citing sheet 21B, family 490, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,116.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVP3-GT9 : accessed 22 August 2015), Walter R Ralph in household of Walter Ralph, Township 5, Tuolumne, California, United States; citing enumeration district (ED) 172, sheet 16A, family 392, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,124.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHHQ-YML : accessed 22 August 2015), Walter R Ralph in household of Walter Ralph, Summersville, Tuolumne, California, United States; citing sheet 12B, family 319, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,153.
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