What is the best reference lists for error coins? So that I can cross reference to so.ething that has already been found?
There are a few websites. Just keep in mind that you might look through thousands of coins and probably never find a major mint error. Most common are Die Breaks, Misaligned Die Strikes and struck through grease. Start with this website http://www.error-ref.com
Here's some of the websites: (Basically they're for doubling on coins). The one that @paddyman98 covers other errors http://doubleddie.com/ http://varietyvista.com/ http://lincolncentresource.com/ http://www.lincolncentsonline.com/ This site also describes different kinds of errors: https://en.wikipedia.org/wiki/Mint-made_errors Happy hunting.
