United States. Bureau of Labor Statistics. "Rubber Products," in United States. Bureau of Labor Statistics. "June 1986," PPI Detailed Report (June 1986) : 71-74. https://fraser.stlouisfed.org/title/63/item/21607/toc/364675 , accessed on May 4, 2024.
United States. Bureau of Labor Statistics. "Rubber Products," in United States. Bureau of Labor Statistics. "June 1986," PPI Detailed Report (June 1986) : 71-74. https://fraser.stlouisfed.org/title/63/item/21607/toc/364675 , accessed on May 4, 2024.