Data Were Affected By Bituminous Coal Worker Strikes In April 1914, November 1919, And April 1927; Anthracite Worker Strikes In September Of 1923 And 1925; Also Anthracite And Bituminous Strike Of April-September 1922 Affected Data. Source: Harvard Economic Series, Review Of Economic Statistics, April 1924, P. 90; August 1929; And Successive Issues.
This NBER data series m01115 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01115
Release: NBER Macrohistory Database
National Bureau of Economic Research, Mining Volume Index, Fuels for United States [M01115USM363SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M01115USM363SNBR/, July 30, 2015.