I'm sure his prized piece was this, from the red-light district of the Expo: the official program from Sally Rand's Nude Ranch
From what I can gather, you purchased a ticket to go indoors to view the nude ranch in its natural setting. While there you could view cowgirls doing the things they do on ranches, such as topless lassoing, nude one-on-one basketball, nude team tennis,
Sorry, but I had to black out the boobs so I could comply with this blog's rules. I already sold this on eBay, but you'll be glad to know that it was purchased by an erotica museum in Las Vegas, where you can go see it yourself.