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O'Callaghan
http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?db=:1824716
Family database as compiled by Eamonn O'Callaghan.
O'Callaghan Family
http://familytreemaker.genealogy.com/users/o/c/a/Irene-Ocallaghan/
Researching the lineage of Laguna Beach, CA USA; compiled by Irene O'Callaghan.
O'Callaghan-O'Brien Ancestors
http://familytreemaker.genealogy.com/users/o/c/a/James-B-Ocallaghan-CT/
Family database as compiled by James B O'Callaghan from Bethel, CT USA.