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This one is close to the Road Runner Hostel (hi everybody, I had a great time there) which, prior to conversion, was once the home of the deputy sheriff of Tucson, famed for his capture of bank-robber John Dillinger.
I have not been able to find any information or other photos on the web about these shelters and I have had to take a digital photo of my 35mm print, which is why the quality is not so good. So if anybody has any information or knows of a website with more information please let me know, Thank You.