Bill Fivaz & J. T. Stanton 
Cherrypicker’s Guide to Rare Die Varieties of United States Coins [EPUB ebook] 

Few Books have taken the coin-collecting community by storm like the Cherrypicker’s Guide to Rare Die Varieties. This handy book tells you how to cherrypick rare coins — how to examine a collection of otherwise normal coins, looking for unusual characteristics: doubled and tripled dies, overdates, repunched mintmarks, and other factors that can reveal a common coins to be a rare and valuable variety.