"New York, New York City Marriage Records, 1829-1940," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/24S5-T49 : 10 February 2018), Denis Sullivan in entry for John O'Brien and Mary Sullivan Hughes, 14 Apr 1902; citing Marriage, Manhattan, New York, New York, United States, New York City Municipal Archives, New York; FHL microfilm 1,570,696.
"New York Marriages, 1686-1980," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/F6HQ-64N : 10 February 2018), Denis Sullivan in entry for John T. O'Brien and Mary Ellen Sullivan Hughes, 14 Apr 1902; citing reference ; FHL microfilm 1,570,696. (retired record)
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