Milton Friedman & Anna J. Schwartz 
Monetary Trends in the United States and the United Kingdom [PDF ebook] 
Their Relations to Income, Prices, and Interest Rates

The special task of this book is to present a statistical and theoretical analysis of the relation between the quantity of money and other key economic magnitudes over periods longer than those dominated by cyclical fluctuations-hence the term trends in the title. This book is not restricted to the United States but includes comparable data for the United Kingdom.