Series Is Presented Here As Two Variables--(1)--Original Data, 1842-1914 (2)--Original Data, 1910-1949. Source: American Iron And Steel Association, Annual Statistical Reports
This NBER data series m04011a appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04011a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Prices of No. 1 Anthracite Foundry Pig Iron for Philadelphia, PA [M0411AUS37980M300NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0411AUS37980M300NNBR/, October 8, 2015.