The Figures Are For June Of Original Data This Series Is Unadjusted For Trend Source: F.R. Macaulay, The Movements Of Interest Rates, Bond Yields And Stock Prices In The U.S. Since 1956, NBER Publication #33, New York City, 1938, Appendix--Table 27.
This NBER data series a12018g appears on the NBER website in Chapter 12 at http://www.nber.org/databases/macrohistory/contents/chapter12.html.
NBER Indicator: a12018g
Release: NBER Macrohistory Database
National Bureau of Economic Research, Deflated Clearings, Outside New York City [A1218GUSA144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A1218GUSA144NNBR/, July 29, 2015.