"New York, New York City Births, 1846-1909," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2W83-RBY : 11 February 2018), Robert Anderson Cromis Langdon, 28 Nov 1900; citing Manhattan, New York, New York, United States, reference cn 3971 New York Municipal Archives, New York; FHL microfilm 2,022,840. (birth location discrepancy)
"New York State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SPN2-MJH : 8 May 2020), Robert A Langdon in household of Charles F Langdon, Bronx, A.D. 34, E.D. 36, New York, New York; citing p. 18, line 27, various county clerk offices, New York; FHL microfilm 1,433,118.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M5Z9-23D : accessed 17 January 2021), Robert U B Langdon in household of Charles F Langdon, Bronx Assembly District 32, New York, New York, United States; citing enumeration district (ED) ED 1455, sheet 5B, family 92, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 997; FHL microfilm 1,375,010.
"New York Records of the State National Guard, 1906-1954," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QVJY-VRTV : 15 January 2021), Robert A C Langdon, 23 Jun 1922; citing Military Service, , , New York, United States, New York State Archives, Albany.
"New York State Census, 1925," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:K9TK-13Q : 8 November 2014), Robert A C Langdon, New York, A.D. 06, E.D. 56, Queens, New York, United States; records extracted by Ancestry and images digitized by FamilySearch; citing p. 5, line 16, New York State Archives, Albany.
"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2CX-6DKF : 29 November 2018), Robert A C Langdon and Edna T Martin, 19 Jul 1925; citing Marriage, Queens, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,903,194.
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