Series Is Presented Here As Two Variables--(1)-- Seasonally Adjusted Data, 1921-1946 (2)--Seasonally Adjusted Data, 1947-1970. 1921-1938 Original NBER Series 08260 Was Divided By Series 8296. These Data Given In 1939 Dollars Are Converted To The Base 1958=100 By Multiplying That Quotient By 43.2, The 1939 Figure On The 1958 Base. Source: Barger And Klein, NBER Series No. 8260: See Note Below
This NBER data series q04216a appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: q04216a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Gross National Product Implicit Price Deflator, Total for United States [Q0416AUSQ072SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q0416AUSQ072SNBR/, October 8, 2015.