United States. Bureau of Labor Statistics. "December 1978," PPI Detailed Report (December 1978). https://fraser.stlouisfed.org/title/63/item/21517, accessed on August 14, 2022.
United States. Bureau of Labor Statistics. "December 1978," PPI Detailed Report (December 1978). https://fraser.stlouisfed.org/title/63/item/21517, accessed on August 14, 2022.