Series Is Presented Here As Two Variables--(1)--Seasonally Adjusted Data, 1921-1938 (2)--Seasonally Adjusted, 1926-1949. Data Reflect The Net Change In End Of Quarter Figures In Current Prices. Source: Harold Barger, "Outlay And Income In The United States,1921-1938, " Studies In Income And Wealth, Vol. 4, 1942, Table 32 (For 1921-1928 Data) And Table 33 (For 1929-1938)
This NBER data series q05102a appears on the NBER website in Chapter 5 at http://www.nber.org/databases/macrohistory/contents/chapter05.html.
NBER Indicator: q05102a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Manufacturing Inventory Investment, Current Prices for United States [Q0502AUSQ144SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q0502AUSQ144SNBR/, October 4, 2015.