Columbia subject headings:
Education and state--United States.
Teachers--Training of--United States.
Teachers--United States--Economic conditions.
Teachers--United States--Social conditions.
Teachers--United States.
Harvard subject headings:
Education and state--United States.
Teachers--Training of--United States
Teachers--United States
Teachers--United States--Economic conditions.
Teachers--United States--Social conditions.
Princeton subject headings:
Education and state--United States.
Teachers--Economic conditions--United States.
Teachers--Training of--United States.
Teachers--United States.