Producer Price Index by Commodity: Telecommunication, Cable, and Internet User Services: All-Distance Business Wired Telephone Service (Partial) (WPU371205)

U.S. Bureau of Labor Statistics, Producer Price Index by Commodity: Telecommunication, Cable, and Internet User Services: All-Distance Business Wired Telephone Service (Partial) [WPU371205], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/WPU371205, .