United States. Bureau of Labor Statistics. "December 1978," PPI Detailed Report (December 1978). https://fraser.stlouisfed.org/title/63/item/21517, accessed on May 10, 2024.
United States. Bureau of Labor Statistics. "December 1978," PPI Detailed Report (December 1978). https://fraser.stlouisfed.org/title/63/item/21517, accessed on May 10, 2024.