National Trails Month History Moment
Long before intrepid explorers of the state's hiking trails set off on their favorite pastime, the Native American inhabitants of the region were criss-crossing this wilderness by foot (without benefit of hydration devices or Vibram-soled boots).
The definitive book on the subject of Native American footpaths in Pennsylvania is the 1963 volume by Paul D. Wallace called "Indian Paths of Pennsylvania." As Wallace writes: "... despite their undoubted historical importance, it is difficult to study and write about Indian paths today, since they have left few visible remains to catch the eye and submit to measurement and appraisal."
Yet he managed in the book to do just that to a degree that is both amazing in its detail and frustrating in the realization of what has been lost to the passage of time.
The book (and a 35-page 1952 treatise for the Historical Society of Pennsylvania) is available online through the Internet Archive, a compendium of free resources available for the clicking. This map illustrates the inside covers (apologies for the off-kilter nature of the center line as I pieced this together from two screenshots) and gives but a taste of the number and variety of these thoroughfares.