Series Is Presented Here As Two Variables--(1)--Original Data, 1919-1930 (2)--Original Data, 1930-1968. Data Are Published As Annual Equivalents And Were Converted By NBER To Represent Monthly Rates By Dividing By 11.77; 12.17; 13.04; 12.62 Depending On Whether The Number Of Days In The Month Is 31, 30, 28, Or 29 (See Source, June, 1931, P. 127). Source: Bureau Of Labor Statistics, Monthly Labor Review, July, 1929 And February, 1931.
This NBER data series m08254a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08254a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Labor Turnover, Total Separation Rate, Manufacturing for United States [M0854AUSM498NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0854AUSM498NNBR/, November 24, 2015.