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wikipedia.org - Sacagawea dollar - Wikipedia
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usacoinbook.com - Native American & Sacagawea Dollars - Price Charts & Coin ...
usmint.gov - Sacagawea Golden Dollar Coin | U.S. Mint
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pcgs.com - Sacagawea Dollar (2000 to Date) Values - PCGS Price Guide
coinauctionshelp.com - Sacagawea Dollar Value - COIN HelpU