Click the image to embiggen. The original map, published in 1775, appeared in several atlases, most famously Thomas Jeffreys’ The American Atlas published by R. Sayer & J. Bennett in 1776. Those interested can see the full-sized map of Pennsylvania (from which this is cropped) by following this link.
What I found particularly useful about this map is the layout–it is insanely detailed and easy to follow and compare to modern maps. It contains forts, creek names, major towns (including Easton), place-names like Gnaddenhutten, and that’s very useful for those looking at pension files.