Columbia subject headings:
Teachers--Supply and demand--United States--Statistics.
Teachers--Training of--United States--Statistics.
Teachers--United States--Attitudes--Statistics.
Teachers--United States--Statistics.
Harvard subject headings:
Teachers--Supply and demand--United States--Statistics.
Teachers--Training of--United States--Statistics.
Teachers--United States--Attitudes--Statistics.
Teachers--United States--Statistics
Princeton subject headings:
Statistics.
Teachers--Supply and demand--United States--Statistics.
Teachers--Training of--United States--Statistics.
Teachers--United States--Attitudes--Statistics.
Teachers--United States--Statistics.