Source: Harvard Economic Series, Review Of Economic Statistics, August 1929 P. 137 And Weekly Letters.
This NBER data series m01050 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01050
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Manufacture of All Basic Materials for United States [M01050USM363SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M01050USM363SNBR/, December 1, 2015.