"New York, County Naturalization Records, 1791-1980," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QPZK-429D : 5 November 2019), Solomon Kaufman, 1910; citing Naturalization, New York, United States, citing multiple County Clerk offices of New York; FHL microfilm 005411246.
"New York, County Naturalization Records, 1791-1980," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QPJP-T6J8 : 5 November 2019), Solomon Kaufman, 1910; citing Naturalization, New York, United States, citing multiple County Clerk offices of New York; FHL microfilm 005411648.
"New York, County Naturalization Records, 1791-1980," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QPZK-429Z : 5 November 2019), Solomon Kaufman, 1914; citing Naturalization, New York, United States, citing multiple County Clerk offices of New York; FHL microfilm 005411246.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M573-CLD : accessed 18 June 2020), Soloman Kaufman, Manhattan Ward 12, New York, New York, United States; citing enumeration district (ED) ED 468, sheet 12A, family 252, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1019; FHL microfilm 1,375,032.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:24QV-MML : 10 February 2018), Salomon in entry for Louis Aronoff Or Aronoft and Rose Koufman, 24 Dec 1916; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,614,652.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6JH-YNW : 25 August 2019), Solomon Kaufman, 1917-1918.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJB5-RVP : accessed 18 June 2020), Solomon Haufman, Manhattan Assembly District 15, New York, New York, United States; citing ED 1103, sheet 15B, line 76, family 320, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1214; FHL microfilm 1,821,214.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X42V-1RR : accessed 18 June 2020), Solomon Kaufman, Manhattan (Districts 0501-0750), New York, New York, United States; citing enumeration district (ED) ED 534, sheet 4A, line 4, family 198, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1566; FHL microfilm 2,341,301.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQRV-948 : 30 January 2020), Solomon Kaufman, father-in-law, in household of Louis Aronoff, Assembly District 18, Brooklyn, New York City, Kings, New York, United States; citing enumeration district (ED) 24-2231, sheet 11B, line 60, family 212, 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 2605.