Source: Morgan Guaranty Trust Company
This NBER data series m13058 appears on the NBER website in Chapter 13 at http://www.nber.org/databases/macrohistory/contents/chapter13.html.
NBER Indicator: m13058
Release: NBER Macrohistory Database
National Bureau of Economic Research, Yields On Twenty Year United States Government Bonds for United States [M13058USM156NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M13058USM156NNBR/, August 3, 2015.