Columbia subject headings:
College teachers--Supply and demand--United States.
Doctor of philosophy degree--United States.
Underemployment--United States.
Harvard subject headings:
College teachers--Supply and demand--United States.
Doctor of philosophy degree--United States.
Underemployment--United States.
Princeton subject headings:
College teachers--Supply and demand--United States.
Doctor of philosophy degree--United States.
Underemployment--United States.