Data Equal To The Sum Of Series (Anthracite Coal Shipments) And Series (Bituminous Coal Production). Source: U.S. Bureau Of Mines, Mineral Resources, 1924, Pp. 588-589.
This NBER data series a01210 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01210
Release: NBER Macrohistory Database
National Bureau of Economic Research, Total Coal Production for United States [A01210USA448NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A01210USA448NNBR/, November 27, 2015.