United States. Department of the Treasury. "Customs Receipts Report, April 30, 1935," in United States. Department of the Treasury. "Volume 14," Press Releases of the United States Department of the Treasury (December 29, 1934 - May 20, 1935) : 464-468. https://fraser.stlouisfed.org/title/6111/item/586853/toc/566596 , accessed on September 22, 2023.