Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Millions of Long Tons, Not Seasonally Adjusted

Frequency:  Annual

Series Is Presented Here As Three Variables--(1)--Original Data, 1889-1915 (2)--Original Data, 1911-1937 (3)--Original Data, 1930-1939. Data Include Iron Ridge Area (Southern Wisconsin); Also Both Railroad And Waterborne Shipments Are Included. Source: Lake Superior Iron Ore Association, Lake Superior Iron Ores, 1938, Pp. 308, 340.

This NBER data series a01194a appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.

NBER Indicator: a01194a