This Series Has Been Adjusted For Trend As Well As For Seasonal Variation. Source: The Annalist, August 18, 1933, P. 213; June 26, 1936, P. 943 (Includes Description); June 18, 1937, P. 973; October 17, 1940, P. 499; October 24, 1940, P. 546
This NBER data series m12007 appears on the NBER website in Chapter 12 at http://www.nber.org/databases/macrohistory/contents/chapter12.html.
NBER Indicator: m12007
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of American Business Activity for United States [M12007USM511SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M12007USM511SNBR/, July 29, 2015.