Massachusetts, Births and Christenings, 1639-1915," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/F4GD-SZQ : accessed 11 May 2014), Richard Joseph Duggan, 05 Aug 1903; citing Boston, Suffolk, Massachusetts, 9079; FHL microfilm 595507
United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M22S-FF5 : accessed 11 May 2014), Richard Duggan in household of Patrick Duggan, Boston Ward 19, Suffolk, Massachusetts, United States; citing enumeration district (ED) 1548, sheet 5B, family 107, NARA microfilm publication T624, FHL microfilm 1374634.
United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFM8-Z3F : accessed 11 May 2014), Richard Duggan in household of Martha Duggan, Boston Ward 4, Suffolk, Massachusetts, United States; citing sheet 4A, family 75, NARA microfilm publication T625, FHL microfilm 1820729.
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