Source: Friedrich A. Lutz, "Corporate Cash Balances, 1914-1943", Manufacturing And Trade, 1945, P. 119
This NBER data series a10043 appears on the NBER website in Chapter 10 at http://www.nber.org/databases/macrohistory/contents/chapter10.html.
NBER Indicator: a10043
Release: NBER Macrohistory Database
National Bureau of Economic Research, Investments Held, Year End, Medium-Sized and Small Manufacturing Corporations for United States [A10043USA174NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A10043USA174NNBR/, July 4, 2015.