I would appreciate some assistance in knowing where to go to track down 18th century Londonderry records for a man who may have been my 5th great grandfather. I have a Jonathan Robertson whose birth date was October 1740. His father may have been William Robertson who emigrated from Ireland to the United States in 1746. I am a direct descendant of Hezekiah Robertson who may have been Jonathan's son. The surname has since been spelled in a variety of ways: Robertson, Robinson, Roberson and Robison. Thank you, Dave Robison Springfield, Massachusetts, USA