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References
- US Trade Dollar: Rarity, Collection Types, and Top 37 Varieties by Joe Kirchgessner
- Chopmarked Coins (Website)
- By Weight Not By Coyne by W. Taylor Leverage
- The United States Trade Dollar Challenge 50 Set by John B. Coxe
- An Introduction to Chopmarked Trade Dollars
- PCGS Trade Dollar Population Report
- CAC Trade Dollar Population Report