Columbia subject headings:
Hours of labor.
Industrial organization.
Leisure.
Unemployed.
United States--Economic conditions--1918-1945.
Harvard subject headings:
Hours of labor
Industrial management
Industrial organization.
Leisure
Unemployed
United States--Economic conditions--1918-1945.
Princeton subject headings:
Hours of labor.
Industrial organization.
Leisure.
Unemployed.
United States--Economic conditions--1918-1945.