Julia seems to have been a popular name among the Crawford Co Looker family. 1850 census shows a Julia, age 70, presumably the wife of John Luker, living in Mead Twp. There is another Julia, age 16, living in the same household, probably the granddaughter of John and Julia. I also seem to remember another Julia Looker, family unknown to me, who was married about 1841-42 in Crawford Co. Unfortunately, I don't have the details readily at hand. I definitely would be interested in anything you have on Julia, whichever one she is.