United States. Department of the Treasury. "Annual Report of the Secret Service, August 24, 1964, Release Number d-1320," in United States. Department of the Treasury. "Volume 144," Press Releases of the United States Department of the Treasury (August 4, 1964 - September 30, 1964) : 104-130. https://fraser.stlouisfed.org/title/6111/item/586987/toc/539486 , accessed on June 21, 2024.