Series Is Presented Here As Two Variables-(1)--Original Data , 1863-1921 (2)--Original Data, 1921-1932. Source: Warren M. Persons And Le Baron K. Foster, "A New Index Of Industrial Production And Trade", Review Of Economic Statistics, August 1933, P. 156.
This NBER data series a01008b appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01008b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Crop Production, Industrial Production and Trade for United States [A0108BUSA331NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A0108BUSA331NNBR, April 30, 2016.