- “Walter Breen’s Encyclopedia of United States and Colonial Proof Coins” by Walter Breen
- “Cameo and Brilliant Proof Coinage of the 1950 to 1970 Era” by Rick Tomaska
- “A Guide Book of Modern United States Proof Coin Sets” by David W. Lange
- “United States Proof Sets and Mint Sets” by Bill Gale & Ron Guth
Coin Collecting from a Historical Perspective - NumiStories.com
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