Right you are. I have about 18 of his pictures including the rare "Garden of the Gods" photo which shows the Stop Sign in the lower right hand corner. The original was ruined by a photo lab and subsequent pictures do not show the Stop Sign. His sister in Arizona sells many of his photographs but some have been withdrawn from circulation.
I don't know how to edit my original post, but his date of death was 9 July 1995 & not 1994 as I had written. Just curious, did you know him or only through his books and photographs?