Price Indexes and Percent Changes for Total Railroad Freight and Selected STCC Groups
United States. Bureau of Labor Statistics. "Price Indexes and Percent Changes for Total Railroad Freight and Selected STCC Groups," in United States. Bureau of Labor Statistics. "March 1981," PPI Detailed Report (March 1981) : 91-91. https://fraser.stlouisfed.org/title/63/item/21544/toc/254069 , accessed on April 19, 2024.