United States. Department of the Treasury. "Public Health Service Announcement on Dentist Visits, March 25, 1938," in United States. Department of the Treasury. "Volume 22," Press Releases of the United States Department of the Treasury (December 15, 1937 - April 15, 1938) : 502-504. https://fraser.stlouisfed.org/title/6111/item/586863/toc/567179 , accessed on April 25, 2024.