Data For 1960-1961 Has Been Converted From A 1947-49 Base To A 1957-59 Base By Applying The Conversion Factor Given In Bulletin 1411, P. 79 (0.9273331). Source: 1926-1959: Bls, Unpublished Mimeographed Table, "Processed Foods, Wholesale Price Index", March 1962; 1960-1963: Bls Bulletin On "Wholesale Prices And Price Indexes", Nos. 1376, 1382, 1411, 1513; 1964-1967:"Wholesale Prices And Price Indexes, " Monthly Bls Publication.
This NBER data series m04055 appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04055
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Wholesale Prices of Processed Foods for United States [M04055USM350NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M04055USM350NNBR/, October 4, 2015.