Columbia subject headings:
Economic history--1918-
Economic history--1918-1945.
Economics.
Machinery in the workplace.
Social history.
United States--Economic conditions--1918-1945.
Harvard subject headings:
Economic history--1918-1945
Economics
Machinery in the workplace
Social history
United States--Economic conditions--1918-1945
Princeton subject headings:
Economic history--1918-1945.
Economics.
Machinery in the workplace.
Social history.
United States--Economic conditions--1918-1945.