Columbia subject headings:
Physics--Study and teaching--United States--Congresses.
Physics--Vocational guidance--United States--Congresses.
Harvard subject headings:
Physics--Study and teaching--United States--Congresses.
Physics--Vocational guidance--United States--Congresses.
Princeton subject headings:
Physics--Study and teaching--United States--Congresses.
Physics--Vocational guidance--United States--Congresses.