United States. Department of the Treasury. "Customs Bureau simplifies air baggage transit through U.S., October 5, 1961," in United States. Department of the Treasury. "Volume 128," Press Releases of the United States Department of the Treasury (October 2, 1961 - December 30, 1961) : 25-31. https://fraser.stlouisfed.org/title/6111/item/586971/toc/538592 , accessed on June 24, 2024.