Last week at my LDS library, I was looking at a tape entitled, "Ireland Marriage Index 1848-1850. (#101242)
My great great grandparents, John McFann and Sarah Jane Norry were both listed as Londonderry. As this was only an index, I have since ordered the film, "Ireland Marriages--1848", (#824282), hoping for more info.
I am eagerly awaiting for this film toarrive. I will post!