"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KZ29-NZZ : 30 December 2021), Louis Robert Brinkmann, 1917-1918.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:X4YJ-LPJ : accessed 9 April 2022), Louis R Bruckman, Indianapolis, Marion, Indiana, United States; citing enumeration district (ED) ED 158, sheet 8A, line 22, family 150, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 613; FHL microfilm 2,340,348.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:V11V-R3D : 5 January 2021), Louis Brinkman, Indianapolis, Marion, Indiana, United States; citing enumeration district (ED) 96-275, sheet 62A, line 5, family 290, 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 1129.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X5FK-3Z6 : 14 March 2020), Louis Rudolph Brinkman, 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J2L9-2Z8 : 9 January 2021), Louis Brinkman, Oct 1968; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Find a Grave, database and images (https://www.findagrave.com/memorial/45889990/louis-r-brinkman : accessed 08 April 2022), memorial page for Louis R. Brinkman (1887–1968), Find A Grave: Memorial #45889990, citing Crown Hill Cemetery, Indianapolis, Marion County, Indiana, USA ; Maintained by John C. Anderson (contributor 47208015) .
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