Data Represent Average Hours Worked Per Week By The Employed Labor Force "At Work": Persons 14 Years And Older Through 1966; Persons 16 Years And Older Thereafter. Source: For 1947-1958 Data: U.S. Census Bureau, Current Population Reports--Labor Force, Series P-50, Annual Reports On The Labor Force; For 1959-1970 Data: Bureau Of Labor Statistics, Monthly Issues Of Employment And Earnings.
This NBER data series m08354 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08354
Release: NBER Macrohistory Database
National Bureau of Economic Research, Average Hours of Work Per Week, Total, Household Survey for United States [M08354USM310NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08354USM310NNBR/, August 29, 2015.