Data From Bls Bulletin No. 543, Ona 1926=100 Base Has Been Converted To A 1957-59=100 Base Using Totals For The Overlapping Year 1926 To Derive The Conversion Factor (681.9/1201.3 = .567365). 1961 Indexes (Bulletin 1382) Were Rebased By Using Factor .9436188 (Bulletin 1411). The Pre-1952 Wholesale Price Index Of Foods Is Continued With The In- Dex Called "All Foods" Which Bls Sources Indicate Is The More Comparable In Terms Of Coverage. Source: 1890-1925: Bls Bulletin #543, Pp. 3-11; 1926-1960: "All Foods, Wholesale Price Index, 1957-1959=100" (Bls Table, March 1962); 1961-1967: Bls, "Wholesale Prices And Price Indexes", Bulletin Nos. 1382, 1411, 1513, And Monthly Issues (Also In Monthly Labor Review For Current Figures.)
This NBER data series m04061 appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04061
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Wholesale Prices of Foods for United States [M04061USM350NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M04061USM350NNBR/, July 4, 2015.