These Data Have Been Derived By NBER And Represent The Sum Of Employees In Mining, Contract Construction And Manufacturing Establishments. Source: Bureau Of Labor Statistics Bulletin 1312-1: "Employment And Earnings Statistics For The United States: 1909-62" For 1939-62 Data; Subsequent Bulletins (1312-5/1967) For 1962-67 Data.
This NBER data series m08330 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08330
Release: NBER Macrohistory Database
National Bureau of Economic Research, Nonagricultural Employment, Commodity Producing Industries for United States [M08330USM175NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08330USM175NNBR/, July 28, 2015.