"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWN8-Z73 : accessed 7 November 2015), Walter Clarke, Hollywood, Luzerne, Pennsylvania, United States; citing enumeration district 157, sheet 603A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1151; FHL microfilm 1,255,151.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3QY-3MQ : accessed 7 November 2015), Walter Clark, Lower Saucon Township South Bethlehem borough Ward 1, Northampton, Pennsylvania, United States; citing sheet 9A, family 172, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,447.
"Pennsylvania, County Marriages, 1885-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VF42-4PF : 12 November 2019), Walter Clark in entry for Abraham L. Knauss and Sarah De R. Clark, 28 Aug 1901; citing Marriage, South Bethlehem, Northampton, Pennsylvania, United States, multiple County Clerks, Pennsylvania.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MG8N-ZXN : accessed 11 December 2019), Walter Clark, Salisbury, Lehigh, Pennsylvania, United States; citing enumeration district (ED) ED 187, sheet 6B, family 129, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1365; FHL microfilm 1,375,378.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFYX-985 : accessed 11 December 2019), Walter Clark, Allentown Ward 13, Lehigh, Pennsylvania, United States; citing ED 190, sheet 5A, line 12, family 104, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1589; FHL microfilm 1,821,589.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHZZ-R3N : accessed 11 December 2019), Walter Clark in household of Charles H Clark, Bethlehem, Northampton, Pennsylvania, United States; citing enumeration district (ED) ED 24, sheet 7A, line 32, family 158, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2086; FHL microfilm 2,341,820.
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