United States. Department of the Treasury. "Canadian Imports," in United States. Department of the Treasury. "Volume 28," Press Releases of the United States Department of the Treasury (June 20, 1939 - October 11, 1939) : 177-181. https://fraser.stlouisfed.org/title/6111/item/586870/toc/567733 , accessed on April 25, 2024.