Columbia subject headings:
Aviation mechanics (Persons)--Vocational guidance--United States.
Mechanics (Persons)--Vocational guidance--United States.
Transportation--Vocational guidance--United States.
Harvard subject headings:
Aviation mechanics (Persons)--Vocational guidance--United States.
Mechanics (Persons)--Vocational guidance--United States.
Transportation--Vocational guidance--United States.
Princeton subject headings: