Source: W. Braddock Hickman, "The Volume Of Corporate Bond Financing Since 1900, " (NBER), Table A16, P. 332 Ff.
This NBER data series m10075 appears on the NBER website in Chapter 10 at http://www.nber.org/databases/macrohistory/contents/chapter10.html.
NBER Indicator: m10075
Release: NBER Macrohistory Database
National Bureau of Economic Research, Bond Extinguishments, Par Value, All Industries for United States [M10075USM311NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M10075USM311NNBR/, July 3, 2015.