There is a small booklet, 36 pages, entitled "Collector's Guide for Colorado, Deadwood, & New Mexico, Casino Chips, Gaming Tokens and Premium Tokens", by Ben Kriegh, 492 Ord Dr., Boulder, Co. 80303.

Marv, as for the listing of variations in your 4th edition guide, I think a note of the variations in the appendix is preferable as it would be difficult to price them, especially, as you say, if there is a possibility of their being altered.

Lisa