Columbia subject headings:
Educational surveys--United States.
Schools--United States--Statistics.
Teachers--Supply and demand--United States--Statistics.
Teachers--United States--Statistics.
Harvard subject headings:
Educational surveys--United States.
Schools--United States--Statistics.
Teachers--Supply and demand--United States--Statistics.
Teachers--United States--Statistics
Princeton subject headings:
Educational surveys--United States.
Schools--United States--Statistics.
Statistics.
Teachers--Supply and demand--United States--Statistics.
Teachers--United States--Statistics.