Data Are Based On Daily Average Output. Data Beginning March 1939 Exclude Carpet And Rug Manufacture; Data Beginning April 1939 Exclude Shipbuilding. Source: Data For 1919-1933: Letter From Y.S. Leong, Division Of Research And Planning, N.R.A. Data For 1934-1940: Letter From Dr. George W.Hervey, Consumers Counsel Division, A.A.A.
This NBER data series m01054 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01054
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Production of Manufactures for United States [M01054USM331SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M01054USM331SNBR/, August 3, 2015.