Series Is Presented Here As Two Variables--(1)--Seasonally Adjusted Data, 1949-1953 (2)--Seasonally Adjusted, 1954-1963. Source: NBER
This NBER data series m16021a appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html.
NBER Indicator: m16021a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Diffusion Index, Manufacturers' New Orders For Durable Goods, Twenty-One Industries, One Month Span for United States [M1621AUSM509SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M1621AUSM509SNBR/, September 3, 2015.