Release: NBER Macrohistory Database
The American Pig Iron Association Discontinued Its Statistical Activites After 1926, Many Plants Closed Down And It Was Difficult To Collect Dependable Statistics. Source: The Record Book Of Business Statistics, Part 2, P. 19
This NBER data series m05016 appears on the NBER website in Chapter 5 at http://www.nber.org/databases/macrohistory/contents/chapter05.html.
NBER Indicator: m05016
National Bureau of Economic Research, Merchant Pig Iron Stocks at Merchant Furnaces for United States [M05016USM576NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M05016USM576NNBR, November 22, 2017.