Mint Error News has 18 pages of price guides, around 100 articles, a glossary with 30 errors etc etc. And a printed quarterly magazine.
mikebyers.com Dealer in Major Mint Errors, Die Trials & Patterns - Author of NLG Best World Coin Book World's Greatest Mint Errors - Publisher & Editor of minterrornews.com.
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richerrors
coindoc
numismedia
Here's a couple of sites. I hope they help
Tom
has 18 pages of price guides, around 100 articles, a glossary with 30 errors etc etc. And a printed quarterly magazine.