Bituminous Coal Production in USA

SUMMARY:

The bicoal.tons data set is a time series that contains the production of bituminous coal in millions of net tons per year, for the years 1920-1968.

SOURCE:

U.S. Bureau of Mines.

The data are also in Tukey, J.W. (1977). Exploratory Data Analysis. Massachusetts: Addison-Wesley Publishing Co.