United States. Bureau of Labor Statistics. "September 1967," CPI Detailed Report (September 1967). https://fraser.stlouisfed.org/title/58/item/22129, accessed on May 7, 2024.
United States. Bureau of Labor Statistics. "September 1967," CPI Detailed Report (September 1967). https://fraser.stlouisfed.org/title/58/item/22129, accessed on May 7, 2024.