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Coins of the United States dollar - Wikipedia
Dollars - Price Charts & Coin Values - USA Coin Book
Dollar coin (United States) - Wikipedia
Presidential $1 Coin Program - United States Mint
Presidential Dollars - Price Charts & Coin Values - USA Coin Book
The United States Mint
Circulating Coins - United States Mint
A Brief History of US Dollar Coins - Invaluable
US Dollar Coins | History, Mintage & Varieties of Silver Dollars
PCGS CoinFacts: Your Digital Encyclopedia of U.S. Coins