Hi Kid - I usually start with Variety Vista. Have a look as they cover all denominations. The list I used is the CONECA listings for Doubled Dies. No pictures, but it's a great resource for a complete listing of varieties by date/mm. I also use Brian's Variety Coins listings and pictures to ID coins, but his list is not complete (but the best for getting pictures of varieties and markers). Unfortunately, he doesn't have an RPM to compare against for the meantime.
























