Series Is Presented Here As Three Variables--(1)--Seasonally Adjusted Data, 1875-1915 (2)--Seasonally Adjusted Data, 1915-1919 (3)--Seasonally Adjusted Data, 1916-1961. Data Were Computed By NBER From Published Percentage Deviations From Normal. Source: 1875-1914 Data Are From W.M. Persons, Forecasting Business Cycles, (John Wiley, New York, 1931), Pp. 93-143; 1915 Data Are From The Review Of Economic Statistics, April 1923, P. 76
This NBER data series m12004a appears on the NBER website in Chapter 12 at http://www.nber.org/databases/macrohistory/contents/chapter12.html.
NBER Indicator: m12004a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Industrial Production and Trade for United States [M1204AUSM516SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M1204AUSM516SNBR, May 2, 2016.