I am not sure if this was mentioned before, and if it was, I apologize. The website of the Pennsylvania Archives has 1816 vintage maps in PDF format that you can download. At first view, they look like maps showing only township boundaries and major towns. However, if you blow them up to 200% scale or greater, you will see that these maps have homestead locations, tributary names, and other landmarks of interest. They have maps for every County in Pennsylvania (at least those that existed in 1816), but the map index appears to cover the entire state. Bill Thomas