Release: NBER Macrohistory Database
These Payments Cover Pensions, Compensation For Injury, And Relief Payments In The Groups "Transportation And Public Utilities" And "Government" (Social Securities Paid By Employers Are Included). Source: Simon Kuznets, National Income And Its Composition, 1919-1938, (NBER No. 40) 1941, Volume I, Table 57, Pp. 322-323.
This NBER data series a08181a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: a08181a
National Bureau of Economic Research, Wages, Salaries and Other Payments To Employees for United States [A0881AUSA144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/A0881AUSA144NNBR, April 20, 2018.