Columbia subject headings:
Printers--United States.
Printing--North America--History.
Printing--South America--History.
Printing--United States--History.
Harvard subject headings:
Printers--United States
Printing--North America--History.
Printing--South America--History.
Printing--United States--History
Princeton subject headings:
Printers--United States.
Printing--North America--History.
Printing--South America--History.
Printing--United States--History.