Heritage Auctions, Inc.
1857 3CS (Regular Strike) Three Cent Silver - PCGS CoinFacts
1862 $3 (Regular Strike) Three Dollar - PCGS CoinFacts
Search Rare Coin Wholesalers, a S.L.Contursi Company
Three Dollar Gold (1854-1889), Coin Explorer
Issue 31, PDF, E Bay
1857 $3 Princess Gold Coin Pricing Guide
Gerry Fortin Rare Coins - Gerry's Daily Blog
PCGS (@pcgscoin) • Instagram photos and videos
The Gold Coins of San Francisco, Part III: Three Dollar Gold
Heritage Auctions, USA-Long Beach (FL) - CoinsWeekly