Ralph,
The most recent one is by Roxie and Gary Held
R&G Casino Collectibles, PO Box 6088, Florence, Ky. 41022-6088. It was put out in 2002. Art Andersons book was put out in 1994. Art Anderson, PO Box 4103, Flint, Mich. 48504-0103.
C.T. Rogers may carry one or both. Andersons book has some history in it, which is useful. Neither book has accurate pricing information. If you get any good old ashtrays, just send them to me, and I'll tell you they are worthless, and offer you next to nothing for them!!!!!!! Hope this helps some. Doug in Kingman, Az.