Data Refer To Baa Grade Bonds. Data Are Monthly Averages Of Published Weekly Figures. Data Beginning In 1962 Are Not Comparable With Previous Years. Source: Computed By NBER From Figures In Moody'S Bond Survey; Also See Federal Reserve Bulletins.
This NBER data series m13065 appears on the NBER website in Chapter 13 at http://www.nber.org/databases/macrohistory/contents/chapter13.html.
NBER Indicator: m13065
Release: NBER Macrohistory Database
National Bureau of Economic Research, Yields On Municipal Bonds, Lowest Rating for United States [M13065USM156NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M13065USM156NNBR/, September 2, 2015.