Columbia subject headings:
Incunabula.
Printers--Germany.
Printing--History.
Harvard subject headings:
Incunabula
Incunabula--Germany--Bibliography
Painters--Germany
Printers--Germany.
Printing--Germany--History--Origin and antecedents.
Printing--History
Princeton subject headings:
Incunabula.
Printers--Germany.
Printing--History.