"Pennsylvania, County Marriages, 1885-1950", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VF78-W51 : Sun Oct 15 14:51:19 UTC 2023), Entry for Joseph Michael Brobson and Catherine Charles Ferguson, 5 Aug 1935.
"Pennsylvania, County Marriages, 1885-1950", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VF7X-JR1 : Sun Oct 15 16:10:02 UTC 2023), Entry for William A. O'Brien and Mary B. Ferguson, 11 Jan 1941.
"United States, GenealogyBank Obituaries, Births, and Marriages 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKKK-D1SH : accessed 29 December 2023), Mary Ferguson in entry for Mary B O'Brien, Florida, United States, 15 Aug 2009; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Naples Daily News, born-digital text.
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