Columbia subject headings:
Employees--Training of--United States--Congresses.
Industrial relations--United States--Congresses.
Trucking--United States--Congresses.
Vocational education--United States--Congresses.
Harvard subject headings:
Princeton subject headings:
Employees--Training of--United States--Congresses.
Industrial relations--United States--Congresses.
Trucking--United States--Congresses.
Vocational education--United States--Congresses.