Hearings Before the Committee on Manufactures, United States Senate, Sixty-sixth Congress, Third Session, on S. 4828, a Bill to Promote the General Welfare by Gathering Information Respecting the Ownership, Production, Distribution, Costs, Sales, and Profits in the Coal Industry and by Publication of Same, and to Recognize and Declare Coal and Its Production and Distribution Charged with Public Interest and Use, and for Other Purposes ...