Columbia subject headings:
Harvard subject headings:
Education, Urban--United States--History.
Education--United States--History--20th century
Vocational education--United States--History.
Vocational education--United States.
Working class--Education--United States--History--20th century.
Working class--Education--United States--History.
Princeton subject headings:
Education, Urban--United States--History.
Education--United States--History--20th century.
Vocational education--United States--History.
Working class--Education--United States--History.