Columbia subject headings:
College teachers--Social conditions--United States--History--20th century.
Educational surveys--United States.
Universities and colleges--United States--Faculty--History--20th century.
Harvard subject headings:
College teachers--United States--Social conditions--20th century.
College teachers--United States--Social conditions--History--20th century.
Educational surveys--United States.
Universities and colleges--United States--Faculty--History--20th century.
Princeton subject headings:
College teachers--United States--Economic conditions.
Educational surveys--United States.
Universities and colleges--United States--Faculty--History--20th century.