Series Is Presented Here As Three Variables--(1)--Original Data, 1889-1915 (2)--Original Data, 1911-1937 (3)--Original Data, 1930-1939. Data Include Beneficiated Ore; Exclude Ore For Paint (Which Is Included In Production Figures) And Manganiferrous Ore Containing Over Five Percent Manganese. Source: Lake Superior Iron Ore, 1938, Pp. 308, 340; U.S. Bureau Of Mines, Minerals Yearbook, 1935-1938.
This NBER data series a01194b appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01194b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Iron Ore Shipments, Total for United States [A0194BUSA418NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A0194BUSA418NNBR, February 12, 2016.