Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Index 1909-1913=100, Not Seasonally Adjusted

Frequency:  Annual

Series Is Presented Here As Two Variables-(1)--Original Data, 1863-1921 (2)--Original Data, 1921-1932. Source: Warren M. Persons, Forecasting Business Cycles, 1931, Pp. 170-171.

This NBER data series a01008a appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.

NBER Indicator: a01008a