... to your question, Yes -- it is a good place to get information -- especially with regard to rarity and the great color pictures. However, it is my experience that the price ranges are a bit hopefull (high). Bear in mind that the authors are in the chip selling business. I have found a more realistic guide to prices to be The Chip Rack by Knapp, Myers & Wheelden. IMHO: you should have both if you collect Nevada chips. (Incidentally, the CC & GTCC has not designated ANY price guide as "Official".)