In the same style as Marvels of the U.S. Mail (1964), informal history mixed with illustrative anecdotes about the choosing of mottos and designs for coins, the mint buildings themselves, counterfeiting and bank robbing. The prediction that money will be replaced in the near future by a single credit card good for all transactions (and backed up, possibly, by an indelibly tattooed number on each individual's wrist) may raise a few eyebrows, as will Arnold's fondness for vague but impressive-sounding statements on the order of ""before 1900 the sum total of all human knowledge doubled about once in every 100 years. By 1960 it doubled once every five years. Today it doubles more often."" In addition, there's little discussion of the economic function of money -- the banking system, credit, the Federal Reserve, and David Cooke gives more technical information on How Money Is Made in a text only slightly older. Small change for large collections.