Data Refers To Prices On The First Of Each Month, Delivered To Lower Lake Ports. Bases For Price Determination Are As Follows (% Of Natural Iron) -- 1895-1904: 52.8%; 1905-11/1906: 53.0%; 12/1906-1939: 51.5%. Source: Iron Trade Review, April 22, 1915, P. 804; "Steel" (Formerly "Iron Trade Review"), January 1, 1934, P. 139, And Following January Issues
This NBER data series m04163 appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04163
Release: NBER Macrohistory Database
National Bureau of Economic Research, Wholesale Price of Iron Ore, Mesabi Non-Bessemer for Lake Superior [M0416341M288NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0416341M288NNBR/, October 4, 2015.