The online home of CONECA, the Combined Organizations of Numismatic Error Collectors of America.
CONECA's new site devoted to die varieties.
Website devoted to Lincoln cent varieties
www.minterrornews.com
Mike Byers' website devoted to mint errors. Free download of his quarterly online magazine.
BJ Neff's exhaustive study of "wavy steps" and "trails" die varieties.
Information on counterfeit detection.
Site devoted to Kennedy halves, including errors and varieties.
A site devoted to defining errors and varieties.
The site for researching all types of die clashes.