Producer Price Indexes and Percent Changes for Commodity Groupings
United States. Bureau of Labor Statistics. "Producer Price Indexes and Percent Changes for Commodity Groupings," in United States. Bureau of Labor Statistics. "March 1978," PPI Detailed Report (March 1978) : 12-13. https://fraser.stlouisfed.org/title/63/item/21508/toc/250319 , accessed on April 19, 2024.