Release: NBER Macrohistory Database
100%- Unemployed % The Quarters Are Ending On March 31St, June 30Th, September 30Th, And December 31St. Source: Computed By NBER From Unemployment Data In Massachusetts Department Of Labor And Industries, Annual Report On The Statistics Of Labor, 1923, Part Iii, Pp.20-21 (The 1923 Data Are In A Letter).
This NBER data series q08009 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: q08009
National Bureau of Economic Research, Employment Trade Union Members, Building Trades for Massachusetts [Q08009US000MAQ519NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/Q08009US000MAQ519NNBR, October 24, 2016.