"Massachusetts Deaths, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:NWZQ-ZKM : 10 December 2014), Mary A. Casey, 01 Jun 1888; citing Waltham, Massachusetts, p 245, State Archives, Boston; FHL microfilm 960,238.
Mary was the twin sister of Bridget who, along with their sisters Hannah and Catherine, died within two weeks of each other of black diphtheria in 1888.
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