Columbia subject headings:
Machinery in the workplace--United States.
Printers--Retirement--United States.
Printers--United States.
Printing industry--Automation--Social aspects--United States.
Harvard subject headings:
Machinery in the workplace--United States.
Printers--Retirement--United States.
Printers--United States
Printers--United States--Retirement.
Printing industry--Automation--Social aspects--United States.
Princeton subject headings:
Machinery in the workplace--United States.
Printers--United States--Retirement.
Printers--United States.
Printing industry--Automation--Social aspects--United States.