Producer Price Indexes for the Output of Selected Census Product Classes
United States. Bureau of Labor Statistics. "Producer Price Indexes for the Output of Selected Census Product Classes," in United States. Bureau of Labor Statistics. "March 1978," PPI Detailed Report (March 1978) : 70-78. https://fraser.stlouisfed.org/title/63/item/21508/toc/250323 , accessed on April 25, 2024.