https://www.catholic.com/encyclopedia/sir-charles-gavan-duffy
Sir Charles Gavan Duffy | Catholic Answers Encyclopedia
Duffy, SIR CHARLES GAVAN, politician and author, b. at Monaghan, Ireland, April 12, 1816; d. at Nice, France, February 9, 1903. Educated in his native town,...
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https://www.awm.gov.au/collection/P10328528
Second Lieutenant Desmond McMahon Gavan Duffy | Australian War Memorial
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https://archive.org/details/youngirelandfrag00duffuoft/page/iv/mode/2up
Young Ireland; a fragment of Irish history, 1840-50 : Duffy, Charles Gavan, Sir, 1816-1903 : Free...