"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M32Q-CZ3 : accessed 23 May 2018), Hallina V Bops in household of Georgetta Bops, Frederick city (north part), Frederick, Maryland, United States; citing enumeration district (ED) 5, sheet 15B, family 375, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,622.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2FP-CM6 : accessed 23 May 2018), Hallie Bopst in household of Ella Bopst, Frederick, Frederick, Maryland, United States; citing enumeration district (ED) ED 56, sheet 11A, family 240, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 564; FHL microfilm 1,374,577.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M632-4MK : accessed 23 May 2018), Hallie V Norris in household of Hugh R Norris, Baltimore Ward 13, Baltimore (Independent City), Maryland, United States; citing ED 212, sheet 2B, line 62, family 33, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 659; FHL microfilm 1,820,659.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X3WK-DJ3 : accessed 23 May 2018), Hallie Norris in household of Hugh Norris, Baltimore (Districts 1-250), Baltimore (Independent City), Maryland, United States; citing enumeration district (ED) ED 193, sheet 27A, line 8, family 411, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 856; FHL microfilm 2,340,591.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7XH-5GZ : accessed 23 May 2018), Hallie V Norris in household of Hugh R Norris, Ward 13, Baltimore City, Baltimore City, Baltimore City, Maryland, United States; citing enumeration district (ED) 4-348, sheet 16A, line 38, family 297, 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 1521.
Find A Grave, database and images (https://www.findagrave.com : accessed 23 May 2018), memorial page for Hallie V Norris (15 Oct 1892–20 Aug 1962), Find A Grave Memorial no. 23760703, citing Mount Olivet Cemetery, Frederick, Frederick County, Maryland, USA ; Maintained by Kim K (contributor 46955000) .
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