Alphabetical Index to Ulster Emigrants to Philadelphia, 1803-1850 - Paperbackby Raymond D. Adams (Author) The Northern Irish port of Londonderry (here referred to as Derry) was the principal port of departure for Irish emigrants during the first half of the nineteenth century. The work at hand is an effort to enumerate the immigrant trade between Derry and the port of Philadelphia for that period of time. Mr. Adams, who combed through U. S. Customs Passenger Lists at the National Archives, the passenger manifests of the Cunard