United States. Department of the Treasury. "Debt Limitation, June 15, 1964, Release Number d-1257," in United States. Department of the Treasury. "Volume 143," Press Releases of the United States Department of the Treasury (June 1, 1964 - July 31, 1964) : 107-109. https://fraser.stlouisfed.org/title/6111/item/586986/toc/539424 , accessed on June 24, 2024.