Federal Reserve Bank of San Francisco. "Stamps for Christmas," Economic Letter (Federal Reserve Bank of San Francisco) (December 26, 1975). https://fraser.stlouisfed.org/title/4960/item/527231, accessed on July 12, 2024.
Federal Reserve Bank of San Francisco. "Stamps for Christmas," Economic Letter (Federal Reserve Bank of San Francisco) (December 26, 1975). https://fraser.stlouisfed.org/title/4960/item/527231, accessed on July 12, 2024.