Data Represent Monthly Averages Of Daily Figures. Source: Federal Reserve Board, Data For 1914-1933: Annual Report, 1928, Pp. 47-49; 1933, Pp. 92-93. Data For 1934: Frb Bulletin, January 1935, P. 13. Data For 1935-1941: Banking And Monetary Statistics, 1943, Pp. 371-372. Data For 1942-1949: Frb Bulletins.
This NBER data series m14069 appears on the NBER website in Chapter 14 at http://www.nber.org/databases/macrohistory/contents/chapter14.html.
NBER Indicator: m14069
Release: NBER Macrohistory Database
National Bureau of Economic Research, Government Securities Held, Federal Reserve Banks for United States [M14069USM144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M14069USM144NNBR/, July 1, 2015.