"New York State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SPD1-56J : 8 March 2021), Burton Madrid in household of Moses Madrid, Warren, E.D. 01, Herkimer, New York; citing p. 11, line 49, various county clerk offices, New York; FHL microfilm 845,910.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JTY9-461 : 7 January 2021), Berton Madrid, Mar 1982; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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