John Robson At Mt. Rushmore Commemorative Coin Launch, February 15, 1991, Release Number nb-1135
Robson, John E., 1930-. "John Robson At Mt. Rushmore Commemorative Coin Launch, February 15, 1991, Release Number nb-1135," in United States. Department of the Treasury. "Volume 305," Press Releases of the United States Department of the Treasury (February 6, 1991 - March 28, 1991) : 61-63. https://fraser.stlouisfed.org/title/6111/item/587148/toc/545584 , accessed on May 18, 2024.