Stephen,
Thanks for your compliment and useful reference sources. I agree with Don Wykoff's observations regarding many Indian land use patterns in IT (say as obtained from US BLM initial land survey plats) remaining stable and identifiable (say as obtained from Google Earth photography) even up to the current time. I recently used this stable land-use feature around Iron Bridge (Keota), Redbank Bridge, Braden (Arkoma), and Zion (Stilwell, on Price's Retreat).
Carroll