Here is the link to the list of things on Wilbur in the UNLV collection and there's no mention of a book although he is mentioned in many books on the early casinos in Las Vegas.

Did you know there was a song:

Sheet Music: “I’ve Got a Date with Wilbur” words and music by Ted Mossman

written for the DI's first anniversary? That should be quite find for a collector.

There are also a couple of Wilbur Clark medals made during the DI days: