Data For 1890-1905 Covers Letter Carriers Only. Data For 1906-1928 Covers Carriers And Clerks. Data Is For Calendar Years. Source: Paul H. Douglas, Real Wages In The United States, P. 378; Douglas And Jennison, The Movement Of Money And Real Earnings In The United States, 1926-1928, University Of Chicago Studies In Business Administration No.3, P. 23.
This NBER data series a08058 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: a08058
Release: NBER Macrohistory Database
National Bureau of Economic Research, Average Annual Salaries of Postal Employees for United States [A08058USA052NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A08058USA052NNBR, February 9, 2016.