Series Is Presented Here As Two Variables--(1)--Original Data, 1919-1923 (2)--Original Data, 1923-1942. For This Variable"Iron And Steel And Their Products" Data Were Used Because The Bureau Of Labor Statistics"Blast Furnaces, Steel Works, And Rolling Mills" Series Begins In 1923. See Memorandum. Source: Bureau Of Labor Statistics Memorandum
This NBER data series m08236a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08236a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Factory Employment, Blast Furnaces, Steel Works, and Rolling Mills for United States [M0836AUSM331NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0836AUSM331NNBR/, August 30, 2015.