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 Two Variables--(1)--Original Data, 1889-1915 (2)--Original Data, 1911-1939. Data Exclude Ore Containing Five Percent Or More Manganese. Source: U.S. Bureau Of The Mines, Mineral Resources.

This NBER data series a01193b appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.

NBER Indicator: a01193b