Percentage Depletion : Hearing Before the Committee on Ways and Means, House of Representatives, Eightieth Congress, First Session, on H R. 1993, a Bill to Provide Percentage Depletion for Fluorspar, Flake Graphite, Vermiculite, Beryl, Feldspar, Mica, Talc, Lepidolite, Spodumene, Barite, Ball and Sagger Clay, Rock Asphalt, and Thenardite, with Respect to Taxable Years Beginning After December 31,…

United States. Congress. House. Committee on Ways and Means.