"New York State Birth Index, 1881-1942", database (Ancestry : accessed 17 Jun 2019), Robert Allenbrand, 9 Feb 1921, Dunkirk, Chautauqua County, New York; Certificate Number: 9613.
"New York Death Index, 1852-1956", database (Ancestry : accessed 17 Jun 2019), Robert J Allenbrand, 20 Sep 1940, Dunkirk, Chautauqua County, New York; Certificate Number: 30747.
Find A Grave, database and images (FAG : accessed 17 June 2019), memorial page for Robert J Allenbrand (11 Jan 1921–29 Sep 1940), Find A Grave Memorial no. 24262202, citing Forest Hill Cemetery, Fredonia, Chautauqua County, New York, USA ; Maintained by Nathan Towne (contributor 46861750).
"New York State Census, 1925," database, FamilySearch (Online Version : 8 November 2014), Robert Allenbrand, Dunkirk Ward 03, A.D. 02, E.D. 04, Chautauqua, New York, United States; records extracted by Ancestry and images digitized by FamilySearch; citing p. 12, line 47, New York State Archives, Albany.
"United States Census, 1930," database with images, FamilySearch (Online Version : accessed 17 June 2019), Robert J Allenbrand in household of Jacob J Allenbrand, Dunkirk, Chautauqua, New York, United States; citing enumeration district (ED) ED 24, sheet 2A, line 32, family 36, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1412; FHL microfilm 2,341,147.
"United States Census, 1940," database with images, FamilySearch (Online Version : 14 March 2018), Robert Allenbrand in household of Jacob Allenbrand, Ward 3, Dunkirk, Dunkirk City, Chautauqua, New York, United States; citing enumeration district (ED) 7-34, sheet 5A, line 32, family 96, 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 2509.
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