Series Is Presented Here As Two Variables--(1)--Seasonally Adjusted, 1919-1940 (2)--Seasonally Adjusted, 1947-1964. Data For 1919-1923 Cover Sixteen Industries; Data For 1923-1940 Cover Twenty-Three Industries. Data For The Years 1919-1923 Were Lowered To The Level Of The Following Years By -917.9. Source: G.H. Moore, Business Cycle Indicators, Vol. 2, NBER
This NBER data series m16056a appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html.
NBER Indicator: m16056a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Cumulated Net Diffusion Index, Industrial Production, 16-24 Industries, Six Month Span for United States [M1656AUSM272SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M1656AUSM272SNBR, February 11, 2016.