Columbia subject headings:
Harvard subject headings:
Balbi, Giovanni, -1298. Catholicon.
Gutenberg, Johann, 1397?-1468
Incunabula--Germany--Specimens.
Printing--Germany--History--Origin and antecedents.
Princeton subject headings:
Gutenberg, Johann, 1397?-1468.
Printing--Specimens--Incunabula.