Federal Reserve Bank of New York. "2721. Postal Unit Numbering System," Federal Reserve Bank of New York Circulars (November 3, 1943). https://fraser.stlouisfed.org/title/466/item/17490, accessed on April 25, 2024.
Federal Reserve Bank of New York. "2721. Postal Unit Numbering System," Federal Reserve Bank of New York Circulars (November 3, 1943). https://fraser.stlouisfed.org/title/466/item/17490, accessed on April 25, 2024.