"New York State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKMP-N5N : 8 March 2021), Mark Sullivan in household of Ann Sullivan, Elmira, Ward 08, E.D. 02, Chemung, New York; citing p. 8, line 18, various county clerk offices, New York; FHL microfilm 850,935.
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M5QQ-FMF : accessed 18 March 2015), Mark H Sullivan in household of Daniel W Ryan, Elmira Ward 8, Chemung, New York, United States; citing enumeration district (ED) 30, sheet 11B, family 241, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,944.
"United States, Veterans Administration Master Index, 1917-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:WQ5F-RKMM : 26 October 2019), Mark Henry Sullivan, ; citing Military Service, NARA microfilm publication 76193916 (St. Louis: National Archives and Records Administration, 1985), various roll numbers.
"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MJ2M-G5G : accessed 18 March 2015), Marcus Sullivan in household of Daniel Ryan, Elmira Ward 8, Chemung, New York, United States; citing sheet 9A, family 195, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,093.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XMRQ-DP6 : accessed 06 Feb 2014), Mark H Sullivan, New Orleans (Districts 1-250), Orleans, Louisiana, United States; citing enumeration district (ED) 0052, sheet , family 254, NARA microfilm publication .
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VYRB-S29 : accessed 06 Feb 2014), Mark H Sullivan, Police Jury Ward 6, East Baton Rouge, Louisiana, United States; citing enumeration district (ED) 17-40, sheet 20A, family 454, NARA digital publication of T627, roll 1398.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JRRY-Y2L : 10 January 2021), Mark Sullivan, May 1974; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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