TCR is a book by Wheelen, Knapp and Myers that lists all known Nevada chips. It is a price guide starting with "A" at $1-2 and ending at Z-9 which is "over $100,000". Z-1 is $800-1100. If you collect Nevada chips you need this book. Just buying one good chip at an antique mall can easily recover the cost of the book every year. Not to mention NOT buying the overpriced stuff,