Source: Confidential Report (May, 1945), Corporate Financial Data For Studies In Business Finance, (Section A - Large Corporations), Table A-38
This NBER data series a09067 appears on the NBER website in Chapter 9 at http://www.nber.org/databases/macrohistory/contents/chapter09.html.
NBER Indicator: a09067
Release: NBER Macrohistory Database
National Bureau of Economic Research, Accounts Receivable, Trading Corporations for United States [A09067USA144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A09067USA144NNBR/, August 29, 2015.