Producer Price Index by Commodity for Transportation Services: Great Lakes-St Lawrence Seaway Water Transportation of Freight (WPS301303)

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U.S. Bureau of Labor Statistics, Producer Price Index by Commodity for Transportation Services: Great Lakes-St Lawrence Seaway Water Transportation of Freight [WPS301303], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/WPS301303, February 19, 2019.