Columbia subject headings:
Machinery in the workplace.
Printers--United States.
Printing industry--United States.
Harvard subject headings:
Machinery in the workplace.
Presswork (Printing)
Printers--United States
Printing industry--Vocational guidance--United States
Princeton subject headings:
Machinery in the workplace.
Presswork (Printing)
Printers--United States.
Printing industry--Vocational guidance--United States.