Series Is Presented Here As Three Variables-- (1)--Original Data, 1850-1894 (2)--Original Data, 1890-1914 (3)-- Original Data, 1913-1968. There Is No Explanation For The Drop In The Figure For July, 1906 (59.7). Source: Annual Averages Copied From Bls, Handbook Of Labor Statistics, 1947 Edition. Bls Bulletin No. 543, Pp. 3-11;
This NBER data series m04048b appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04048b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Wholesale Prices for United States [M0448BUSM336NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0448BUSM336NNBR/, September 5, 2015.