The ChipRack, a publication that provides a record of all chips issued in Nevada, listed by casino. The authors of The ChipRack (TCR) have assigned a letter code to all of the chips listed in their excellent publication (A through Z). Each letter represents a different dollar value (Q=$200 to $249) and is a baseline that many use to put a dollar value on their chips. Having both TCR and the US price guide from Campiglia & Wells are a "must" for most collectors. If you already knew this.....NEVERMIND!!! Steve B