Producer Price Indexes, Changes in Commodity Specifications
United States. Bureau of Labor Statistics. "Producer Price Indexes, Changes in Commodity Specifications," in United States. Bureau of Labor Statistics. "March 1978," PPI Detailed Report (March 1978) : 63-63. https://fraser.stlouisfed.org/title/63/item/21508/toc/250313 , accessed on April 19, 2024.