- “The Early Coins of America” by Sylvester S. Crosby
- “Walter Breen’s Encyclopedia of United States Half Cents 1793-1857″ by Walter Breen
- “American Half Cents: The Little Half Sisters” by Roger S. Cohen, Jr.
- “The Half Cent Die State Book: 1793-1857″ by Ronald Manley
- “Walter Breen’s Encyclopedia of Early United States Cents 1793-1814″ by Walter Breen
- “United States Copper Cents” by Howard Newcomb
- “Penny Whimsy” by William H. Sheldon
- “The Cent Book 1816-1839″ by John D. Wright
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