Both the Mennonite Historical Society and the Lancaster Historical Society (both located in Lancaster) have a wealth of information. (Even if your people are not Mennonite, it's worth checking out as they have a lot of material available.) When I stopped at the public library in Lancaster, I was not as impressed by their collection of material. You will also want to check the early county historic records office, but I don't remember their address. I found a lot of things in early wills and early land records. Karen