Source: U.S. Bureau of Economic Analysis
Real Manufacturing and Trade Inventories is used in the calculation of INVCMRMTSPL (https://fred.stlouisfed.org/series/INVCMRMTSPL ). This series is based on the North American Industry Classification System (NAICS), which replaced the Standard Industrial Classification (SIC) system. The SIC is no longer published with this release, and the SIC series is INVHMRMT (https://fred.stlouisfed.org/series/INVHMRMT).
U.S. Bureau of Economic Analysis, Real Manufacturing and Trade Inventories [INVCMRMT], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/INVCMRMT, October 18, 2017.