I have been doing research on the Allen & related families for over 30 years. They are from Henderson Co., NC. I have seen parts of Rev. Allen's sermon book & have copies of part of it. I put together the info on Ben Allen several years ago. He was my G.Grandmothers brother & his wife was my G. Grandfathers cousin. You will find this info posted on the Henderson Co., NC GENWEB site.