Thaky you all for your responses. Unfortunately I went on vacation just after my first post and then life has just not had enough time to spend on "the net". Finally a break to spend some research time.
I plan tonight to begin the search of the American Map archives? for the data. I will be interested to see how well I was able to figure out what the route was from Bishop west. I did find, interestingly, some copies of early road maps on some sites on the net which gave me some clues.
For the member plotting where we all live, I am in Phillipsburg, N.J. (just where I-78 crosses the Delaware River and about 60 miles south of the closest section of 6 in Milford Pa. We do get to ride (motorcycle) the portion of 6 from Scanton east several times a year, usually when going from one place to another, but for the most part this is a picturesque part of the road and a fun easy ride.
Unfortunately although a lot of the Pa portion is a striking road there is also a fair of smaller (by eastern standards) old towns that are rather pesky to get through.
Hope to participate with this group.