Data Are Computed By NBER From Total Pig Iron Production Less Pig Iron Produced By Steel Mills. Source: Iron Age, Successive Monthly Issues
This NBER data series m01131a appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01131a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Merchant Pig Iron Production for United States [M0131AUSM528NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0131AUSM528NNBR/, July 5, 2015.