I picked up a copy of Howdy's Illustrated Guide to Nevada Silver Strikes at the Gambler's General Store www.gamblersgeneralstore.com in Las Vegas two months ago. Another good one is by Jim Turnbow at jimt@jimbow.ipmail.att.net and if you email him he will send you a sample page from his book. I also have Art Becker's book www.artbecker.com All are excellent sources. Hope this helps...