Columbia subject headings:
Harvard subject headings:
Community colleges--History--20th century.
Education, Higher--History--20th century.
Education, Higher--Social aspects--History--20th century.
Education, Higher.
Non-formal education.
Proprietary schools--History--20th century.
Technical institutes--History--20th century.
Princeton subject headings:
Community colleges--History--20th century.
Education, Higher--History--20th century.
Education, Higher--Social aspects--History--20th century.
Proprietary schools--History--20th century.
Technical institutes--History--20th century.