Columbia subject headings:
Astronomischer Kalender für 1448.
Printing--Germany--Mainz (Rhineland-Palatinate)--History.
Printing--History--Origin and antecedents.
Harvard subject headings:
Astronomischer Kalender für 1448.
Printing--Germany--Mainz--History.
Printing--History--Origin and antecedents
Princeton subject headings:
Printing--History--Origin and antecedents.
Printing--Mainz--History.