Weekly coal production.
United States.Energy Information Administration.
United States.Office of Coal, Nuclear, Electric, and Alternate Fuels.
Washington, D.C. : Energy Information Administration, Office of Coal, Nuclear, Electric, and Alternate Fuels, U.S. Dept. of Energy : [Supt. of Docs., U.S. G.P.O., distributor,
"DOE/EIA-0218."
Coal trade