Data Represent Monthly Averages Of Daily Figures. The Variable Ends In September 1939. The Figure For October 1939 Is Less Than $500,000 And Thereafter No Bills Were Bought (See Banking And Monetary Statistics, 1943, P. 362). Source: Federal Reserve Board, Data For 1915-1934: Frb Annual Report, 1928, Pp. 47-49; 1933, Pp. 92-93; 1934, P. 83. Data For 1935-1939: Banking And Monetary Statistics.
This NBER data series m14068 appears on the NBER website in Chapter 14 at http://www.nber.org/databases/macrohistory/contents/chapter14.html.
NBER Indicator: m14068
Release: NBER Macrohistory Database
National Bureau of Economic Research, Bills Bought, Federal Reserve Banks for United States [M14068USM144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M14068USM144NNBR/, October 10, 2015.