Columbia subject headings:
Printing--History--19th century.
Printing--History--20th century.
Typesetting machines--Chronology.
Typesetting machines--History.
Typesetting--Chronology.
Typesetting--History.
Harvard subject headings:
Printing--History--19th century.
Printing--History--20th century.
Typesetting machines--Chronology.
Typesetting machines--History.
Typesetting--Chronology.
Typesetting--History--Chronology.
Typesetting--History.
Princeton subject headings: