Series Is Presented Here As Two Variables--(1)-- Original Data, 1935-1952 (2)--Original Data, 1946-1969. Through 1949, The Indexes Represent Averages Of 4 Or 5 Quotations A Month; Thereafter, They Are Based On Daily Quotations. For 1946-1947 The Averages Have Been Derived From The Source (See Above) Showing Indexes To 1 Decimal Only; All Published Averages, However, Are Based On Indexes Carried To 2 Decimal Places. Source: Bls Tables (Unpublished): "Daily Spot Market Price Index, 1956 And Earlier, All Commodities" (December, 1962), And Similar Table Dated October, 1962, For 1957-September, 1962. Thereafter: "Daily Spot Market Price Indexes And Prices", Weekly Bls Release. Averages Are Also In Survey Of Current Business.
This NBER data series m04195 appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04195
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Spot Market Prices of 22 Commodities for United States [M04195USM350NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M04195USM350NNBR/, October 9, 2015.