Series Is Presented Here As Two Variables--(1)--Original Data, 1888-1926 (2)--Original Data, 1921-1939. Data Are End Of Month. Ministry Of Labour Gazette Contains Data For Manual Workers. Source: Abstact Of Labor Statistics, Particularly 10Th, 16Th, And 19Th Abstracts.
This NBER data series q08004a appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: q08004a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Trade Union Members Unemployed, Building Trades for Great Britain [Q0804AGBQ515NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q0804AGBQ515NNBR, February 12, 2016.