Columbia subject headings:
Household employees--North America--History--20th century.
Household employees--United States--History--20th century.
Harvard subject headings:
Household employees--North America--History--20th century.
Household employees--United States--History--20th century.
Women household employees--United States--History--20th century.
Princeton subject headings:
Household employees--North America--History--20th century.
Household employees--United States--History--20th century.