Series Is Presented Here As Four Variables--(1)--Original Data, 1890-1915 (2)--Original Data, 1914-1922 (3)--Original Data, 1922-1941 (4)--Original Data, 1938-1958. Source: NBER Compiled Prices Of Four Types Of Pig Iron In Bls Bulletins On Wholesale Prices And Computed The Data In This Series, Weighting The Four Component Series.
This NBER data series m04010a appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04010a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Wholesale Price of Pig Iron, Composite for United States [M0410AUSM288NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0410AUSM288NNBR, April 28, 2016.