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The NNP Encyclopedia (https://nnp.wustl.edu/encyclopedia/catalog?catalogId=1) supplies overviews, values, and auction prices realized for U.S. coins. Auctions prices realized, in particular, are quite useful for evaluating thinly traded issues. Auction results further reflect actual market trades, rather than guide book estimates. Data is aggregated from the largest U.S. auction houses and presented in an easy-to-access tabular format.