"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3KM-LXK : accessed 21 April 2020), John H Loos in household of George Loos, Election District 2, Precinct 2, Baltimore, Maryland, United States; citing enumeration district (ED) 24, sheet 2A, family 26, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,606.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2FZ-7QT : accessed 21 April 2020), Henry J Loos, Baltimore Ward 17, Baltimore (Independent City), Maryland, United States; citing enumeration district (ED) ED 282, sheet 8A, family 191, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 558; FHL microfilm 1,374,571.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M63B-TSW : accessed 21 April 2020), Henry J Loos, Baltimore Ward 17, Baltimore (Independent City), Maryland, United States; citing ED 288, sheet 9A, line 6, family 183, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 662; FHL microfilm 1,820,662.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X3WS-NRB : accessed 21 April 2020), Lottie W Loos in household of G Henry Loos, Election District 05, Baltimore, Maryland, United States; citing enumeration district (ED) ED 30, sheet 3B, line 63, family 70, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 845; FHL microfilm 2,340,580.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K76K-HXD : 28 February 2020), Lottie W Loos in household of J Henry Loos, Election District 2, Baltimore, Maryland, United States; citing enumeration district (ED) 3-29A, sheet 3A, line 22, family 42, 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 1503.
Find a Grave, database and images (https://www.findagrave.com : accessed 20 April 2020), memorial page for John Henry Loos (13 Jan 1863–2 Oct 1952), Find a Grave Memorial no. 41901017, citing Mount Olive Cemetery, Randallstown, Baltimore County, Maryland, USA ; Maintained by dianna (contributor 47119200) .[1]
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