The effect of government regulation on the production and use of coal. Part 1 : hearings before the Select Committee on Small Business, United States Senate, Ninety-sixth Congress, first session on the effect of government regulations on the production and use of coal, Lexington, KY.--May 11, 1979, Washington, D.C.--May 14, 1979, Washington, D.C.--May 15, 1979