Treasury announces adoption of final regulations on mineral depletion deductions, March 13, 1972
United States. Department of the Treasury. "Treasury announces adoption of final regulations on mineral depletion deductions, March 13, 1972," in United States. Department of the Treasury. "Volume 178," Press Releases of the United States Department of the Treasury (March 1, 1972 - April 29, 1972) : 131-133. https://fraser.stlouisfed.org/title/6111/item/587021/toc/542605 , accessed on June 25, 2024.