Series Is Presented Here As Two Variables--(1)-- Original Data, 1891-1919 (2)--Original Data, 1919-1927. The Index Is The Simple Geometric Average Of Prices For First Of Each Month Of Ten Commodities Relative To The Geometric Average Price For 1890-1899 As The Base (Pig Iron, Bar Iron, Coke, Spelter, Hides, Cotton Sheetings, Print Cloths, Worsted Yarns, Salt Mess Pork, And Cottonseed Oil). Source: Review Of Economic Statistics, Harvard Economic Service, Monthly Supplement
This NBER data series m04050a appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04050a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Price Index of Business Cycles for United States [M04G0AUSM315NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M04G0AUSM315NNBR/, October 4, 2015.