United States. Bureau of Labor Statistics. "July 1971," CPI Detailed Report (July 1971). https://fraser.stlouisfed.org/title/58/item/22272, accessed on April 23, 2024.
United States. Bureau of Labor Statistics. "July 1971," CPI Detailed Report (July 1971). https://fraser.stlouisfed.org/title/58/item/22272, accessed on April 23, 2024.