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1. Error World -
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Australian Obverse Master Die List - Australian Obverse Master Die Listings 
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Canadian Die Variety Directory -
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Coin Facts - 
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Coin Resource -
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CoinVarieties group - "Coin Varieties Group"  Coin Varieties
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CONECA -
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Coppercoins -
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FlyInClub.COM -
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Kyle Vick's Stanton Books - 
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Lincoln Cents - 
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Mint Error News -
The Official News Magazine of Error World Groups 
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More on World Coin Varieties and their Identification - Alexander Kuznetsov's World Coin Site. 
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NCADD - NCADD ~ "The National Collectors Association of Die Doubling" 
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Night Vision--IntaglioSunSet The Numasmatic Bookstore -
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