United States. Department of the Treasury. "U.S. and El Salvador sign $6 million Exchange agreement, July 14, 1961," in United States. Department of the Treasury. "Volume 126," Press Releases of the United States Department of the Treasury (June 2, 1961 - July 31, 1961) : 451-453. https://fraser.stlouisfed.org/title/6111/item/586969/toc/538522 , accessed on June 24, 2024.