"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3SH-411 : accessed 13 July 2020), Harry J Ricker in household of John V Ricker, Swatara Township, Precinct 2, Dauphin, Pennsylvania, United States; citing enumeration district (ED) 105, sheet 24A, family 425, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,404.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGQ5-H21 : accessed 13 July 2020), Harry J Ricker in household of Sarah Ricker, Swatara, Dauphin, Pennsylvania, United States; citing enumeration district (ED) ED 127, sheet 48B, family 919, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1338; FHL microfilm 1,375,351.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFY3-2MD : accessed 13 July 2020), Harry J Ricker, Hummelstown, Dauphin, Pennsylvania, United States; citing ED 112, sheet 21A, line 46, family 522, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1557; FHL microfilm 1,821,557.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHSW-51B : accessed 13 July 2020), Harry J Ricker, Swatara, Dauphin, Pennsylvania, United States; citing enumeration district (ED) ED 108, sheet 11A, line 44, family 214, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2028; FHL microfilm 2,341,762.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQFZ-4VW : 28 July 2019), Harry Ricker, Swatara Township, Dauphin, Pennsylvania, United States; citing enumeration district (ED) 22-126, sheet 19A, line 35, family 387, 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 3486.
Find a Grave, database and images (https://www.findagrave.com/memorial/54476492/harry_john-ricker: accessed March 20, 2024), memorial page for Harry John Ricker (5 Jan 1891–8 Apr 1971), Find a Grave Memorial ID 54476492, citing Woodlawn Memorial Gardens, Lower Paxton Township, Dauphin County, Pennsylvania, USA; Maintained by Michael Milliken (contributor 33120843).
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