Series Is Presented Here As Two Variables--(1)--Seasonally Adjusted Data, 1919-1946 (2)--Original Data, 1919-1963. Data From 1919-1946 Were Converted From A 1947-1949=100 Base To A 1957-1959=100 Base By Multiplying By .668002. See Also Federal Reserve Board Bulletin, April, 1964, P.446. Source: Federal Reserve Board, Data For 1919-1938: "Revised Index Of Department Store Sales", Federal Reserve Bulletin, June 1944; Data For 1939-1947: "Department Store Sales, U.S.", Mimeo Release, Research And Statistics 1344, Corrected As Of May 1947, Furnished By Frb; Data For 1948-May 1962: Federal Reserve Bulletin Of July 1962; Data For June 1962-1963: Bulletins And The Release "Monthly Department Store Sales".
This NBER data series m06002b appears on the NBER website in Chapter 6 at http://www.nber.org/databases/macrohistory/contents/chapter06.html.
NBER Indicator: m06002b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Department Store Sales for United States [M06F2BUSM350NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M06F2BUSM350NNBR/, September 3, 2015.