Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1934 (2)--Original Data, 1931-1969. Maturity Periods Covered By Data Are: Three Months To February 16, 1934; Six Months From February 23, 1934 To February 23, 1935; Nine Months From March 1, 1935 To October 15, 1937; Bills Maturing About March 16, 1938 From October 22 To December 10, 1937; Three Months From December 17, 1937 To Date (See Frb Bulletin, May 1945, P. 490.) Beginning In March 1941 Yields Became Taxable; They Were Previously Tax Exempt. Data Beginning In January 1947 Are Revised Data Based On New Bills Issued Within The Period; Previously Data Were Based On New Issues Announced (See Frb, September 1950, P. 1216). Source: Federal Reserve Board, Federal Reserve Bulletin, May 1945 And Following Monthly Issues.
This NBER data series m13029b appears on the NBER website in Chapter 13 at http://www.nber.org/databases/macrohistory/contents/chapter13.html.
NBER Indicator: m13029b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Yields On Short-Term United States Securities, Three-Six Month Treasury Notes and Certificates, Three Month Treasury Bills for United States [M1329BUSM193NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M1329BUSM193NNBR/, August 4, 2015.