Data For December, 1962-March, 1963 And September, 1965 Are Partly Estimated (Letter Of October 13, 1965) Due To Newspaper Strikes. Source: Beveridge Organization, Incorporated Of Chicago, "Executrend" By Keidrick And Struggles.
This NBER data series m08335 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08335
Release: NBER Macrohistory Database
National Bureau of Economic Research, Help-Wanted Display Ads For Executive Positions In Newspapers, Total for United States [M08335USM499NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08335USM499NNBR/, October 4, 2015.