From Bob Shippee http://www. rarecoinman. com/Sumner. htmWilliam G. Sumner, a professor of Political & Social Sciences at Yale, wrote his history of American currency in 1874. The full title of his treatise is A History of American Currency with Chapters on The English Bank Restriction and Austrian Paper Money. He covers everything from American Indian Wampumpeag currency (which traded at an exchange rate of 6 white beads or three black beads to an English penny) to the then-recent Panic of 1873. | A History Of American Currency by William G Sumner, Paperback | Indigo Chapters