That looks like great information. I am going to try this one again. I was on the ARCGIS website where it overlays the older map onto today's contours and they look much different. Also, the road on the old map is heading parallel to, but significantly north of the existing road.
Yesterday, I was looking for a benchmark (BM 1965) at the road junction named "Salt Wells" on the same map. I found an old rusted 2-3" steel pipe laying on the ground. Could that have been it, but someone dug it up out of the ground?
Strangely, I have randomly found many markers out in the desert, but I have not found those on any map and the ones on the maps I can never find out in the desert.