I'm new to the list. I'm searching for information on my wife's gg grandfather, Joseph Shannon b. 18 Oct 1815 in Londonderry, who we believe came to America through Dublin to Pennsylvania between 1840-1845. He filed his intent to become a naturalized citizen 14 Mar 1845. I would appreciate any help you might be able to give me. Thanks Jim Batdorff Coos Bay, OR USA